{"title":"Rotax Max Wiring Harness, Ignition Parts - New Style","description":"","products":[{"product_id":"rotax-125-max-evo-wiring-harness","title":"1. 666836 Rotax 125 MAX EVO Wiring Harness","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Wiring Harness\u003c\/strong\u003e (R.666836) is the complete OEM electrical harness for the Rotax 125 MAX EVO engine. This harness carries all engine electrical signals and power connections — ignition coil, pick-up sensor, electric starter, starter relay, ECU, multiple function switch, RAVE solenoid, and battery — in a single factory-built loom. It is the backbone of the Rotax EVO electrical system and replaces the older non-EVO harness used on pre-EVO MAX engines.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. This is the new EVO-style harness — confirm your engine specification before ordering.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.666836\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eA damaged or shorted wiring harness is one of the more time-consuming electrical faults to diagnose. Keeping a spare on hand for race weekends is good insurance. CMC Karting stocks the complete Rotax 125 MAX EVO electrical parts line.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979659997,"sku":"R.666836","price":171.08,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-ignition-pick-up-sensor","title":"2. 265560 Rotax 125 MAX EVO Ignition Pick-Up Sensor","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Ignition Pick-Up Sensor\u003c\/strong\u003e (R.265560) is the OEM crankshaft position sensor that generates the ignition trigger signal for the Rotax ECU. Mounted at the crankcase adjacent to the starter ring gear, the pick-up sensor detects the passing teeth of the ring gear to time ignition precisely at every revolution. A faulty pick-up sensor is a common cause of no-start, misfiring, or inconsistent ignition on the Rotax 125 MAX EVO and is one of the first components to check in an ignition fault diagnosis.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Includes rubber gasket — gasket is not available separately. Secured with two M6 screws (R.241935 for machined flange crankcases, or R.941251 taptite screws for non-machined flange crankcases).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.265560\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Rubber gasket (not sold separately)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWhen diagnosing a no-spark condition, always check the pick-up sensor gap and connector before replacing the coil or ECU. CMC Karting stocks the full Rotax 125 MAX EVO ignition and electrical parts line.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979692765,"sku":"R.265560","price":92.0,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-electric-starter-assembly","title":"3. 294805 Rotax 125 MAX EVO Electric Starter Assembly","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Electric Starter Assembly\u003c\/strong\u003e (R.294805) is the complete OEM electric starter motor unit for the Rotax 125 MAX EVO engine. The Rotax electric starter is a defining feature of the MAX EVO platform, allowing push-button starts via the multiple function switch without a push start or separate start motor box. This assembly includes the starter motor and all internal components — when the starter fails to crank, spin weakly, or makes grinding noises, replacing the full assembly is the most reliable fix.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Mounts to the crankcase via the Starter Support Ring (R.251670) and is secured with one M6x35 Allen Bolt (R.241814) and one M6x30 Allen Bolt (R.840888). Internal components can be rebuilt using the Starter Rebuild Kit (R.281262).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.294805\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eBefore replacing the full starter assembly, consider the Starter Rebuild Kit (R.281262) if only the brushes or springs are worn. CMC Karting stocks both the complete assembly and the rebuild kit.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979725533,"sku":"R.294805","price":247.25,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-starter-cable-assembly","title":"5. 265532 Rotax 125 MAX EVO Starter Cable Assembly","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Starter Cable Assembly\u003c\/strong\u003e (R.265532) is the OEM electrical cable that connects the electric starter motor to the starter relay on the Rotax 125 MAX EVO engine. This heavy-duty cable carries the full cranking current from the battery through the relay to the starter motor and must be in good condition for reliable starts. Inspect for fraying, corrosion at the terminals, or heat damage — a degraded cable causes slow cranking or intermittent start failures.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Retained with the Cable Clamp (R.651940) and works in conjunction with the Electric Starter Assembly (R.294805) and Starter Relay (R.992819).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.265532\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks the complete Rotax 125 MAX EVO electrical and starter system parts so you can diagnose and repair starter faults without multiple orders.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979758301,"sku":"R.265532","price":27.27,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-starter-cable-clamp","title":"6. 651940 Rotax 125 MAX EVO Starter Cable Clamp","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Starter Cable Clamp\u003c\/strong\u003e (R.651940) is the OEM clamp that secures the starter cable assembly (R.265532) to the engine on all Rotax 125 MAX EVO engines. This small but important hardware item keeps the starter cable routed correctly and protected from heat and abrasion. A missing or broken cable clamp allows the starter cable to contact hot engine components or vibrate against the chassis, leading to premature cable failure.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.651940\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAn inexpensive part that protects a much more expensive cable. CMC Karting stocks it alongside the complete Rotax starter system parts line.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979791069,"sku":"R.651940","price":7.02,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-starter-rebuild-kit","title":"8. 281262 Rotax 125 MAX EVO Electric Starter Rebuild Kit","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Electric Starter Rebuild Kit\u003c\/strong\u003e (R.281262) contains all the internal wear components needed to rebuild the Rotax electric starter motor in place, without replacing the full starter assembly. The kit includes two compression springs, one carbon brush left, one carbon brush right, one O-ring, and two M3x8 screws — everything needed to restore a slow-cranking or intermittently failing starter to full performance.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Use this kit when the starter turns slowly, makes clicking noises, or fails to engage — symptoms that typically indicate worn carbon brushes rather than a failed motor. Rebuilding with this kit is considerably more cost-effective than replacing the full starter assembly (R.294805).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.281262\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contains:\u003c\/strong\u003e 2x M3x8 screws, 2x compression springs, 1x carbon brush left, 1x carbon brush right, 1x O-ring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eKeep one of these in your spares kit — a starter rebuild at the track takes about 20 minutes and can save a race weekend. CMC Karting stocks the rebuild kit and the complete starter assembly for all repair scenarios.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979823837,"sku":"R.281262","price":33.67,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-starter-support-ring","title":"9. 251670 Rotax 125 MAX EVO Starter Support Ring","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Starter Support Ring\u003c\/strong\u003e (R.251670) is the OEM bracket that mounts the electric starter assembly (R.294805) to the crankcase on all Rotax 125 MAX EVO engines. This machined support ring positions the starter motor correctly relative to the starter reduction gear, ensuring proper mesh and reliable engagement. A damaged or incorrectly fitted support ring will cause misalignment of the starter, leading to grinding noises and premature wear of both the starter and reduction gear.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Secured to the crankcase with M6x35 (R.241814) and M6x30 (R.840888) Allen bolts.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.251670\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks the Rotax starter support ring along with the full electric starter system components for the Rotax 125 MAX EVO.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979856605,"sku":"R.251670","price":14.05,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-allen-screw-m6x35-starter","title":"10. 241814 Rotax 125 MAX EVO Allen Screw M6x35 – Starter Mount","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Allen Screw M6x35\u003c\/strong\u003e (R.241814) is the OEM ISO 4762 Grade 8.8 socket head cap screw used to secure the electric starter assembly to the crankcase on all Rotax 125 MAX EVO engines, tightened to 10 Nm. One of these M6x35 bolts is used at the primary starter mount point, working together with the M6x30 Allen Bolt (R.840888) to hold the starter in its support bracket (R.251670).\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.241814\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M6 x 35mm, ISO 4762, Grade 8.8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTightening Torque:\u003c\/strong\u003e 10 Nm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks all Rotax 125 MAX EVO starter mounting hardware alongside the complete starter system parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979889373,"sku":"R.241814","price":1.31,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-allen-screw-m6x30","title":"11. 840888 Rotax 125 MAX EVO Allen Screw M6x30","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Allen Screw M6x30\u003c\/strong\u003e (R.840888) is the OEM ISO 4762 Grade 8.8 socket head cap screw used at multiple points in the Rotax 125 MAX EVO engine assembly, including as one of two fasteners securing the electric starter to the crankcase (tightened to 10 Nm). This M6x30 bolt is also referenced in several other chapters of the Rotax parts catalog, making it one of the most commonly used fasteners across the EVO engine.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.840888\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M6 x 30mm, ISO 4762, Grade 8.8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTightening Torque:\u003c\/strong\u003e 10 Nm (starter application)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eKeep a few of these in your spares kit — the M6x30 is one of the most widely used fasteners across the Rotax 125 MAX EVO. CMC Karting carries the full Rotax OEM hardware line.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979922141,"sku":"R.840888","price":1.31,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-ignition-coil-red-cap","title":"12. 666826 Rotax 125 MAX EVO Ignition Coil with Red Spark Plug Cap","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Ignition Coil with Red Spark Plug Cap\u003c\/strong\u003e (R.666826) is the OEM ignition coil assembly for all current Rotax 125 MAX EVO engines. This unit combines the ignition coil and a red spark plug cap (R.866707) in a single assembly. The coil transforms battery voltage into the high-voltage spark needed to fire the NGK GR8DI spark plug and is controlled by the engine's ECU based on the trigger signal from the pick-up sensor (R.265560). The red cap version (R.666826) is the current EVO production standard.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Mounts to the cylinder head area and is secured with the coil mounting hardware (R.842041, R.244211). The spark plug connector\/cap (R.866700) is sold separately if only the cap requires replacement.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.666826\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Ignition coil + red spark plug cap (R.866707)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eBefore replacing the coil, test for spark with a known-good plug and check the pick-up sensor gap. CMC Karting stocks the full Rotax ignition system — coil, sensor, plug cap, and spark plugs.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979954909,"sku":"R.666826","price":147.07,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-spark-plug-connector-red","title":"13. 866700 Rotax 125 MAX EVO Spark Plug Connector – Red Short Cap","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Spark Plug Connector\u003c\/strong\u003e (R.866700) is the OEM red short-style spark plug cap that connects the ignition coil lead to the NGK GR8DI spark plug on all current Rotax 125 MAX EVO engines. This is the standard red short cap supplied with the R.666826 ignition coil and is available separately when only the cap needs replacement — saving the cost of a full coil assembly. A cracked, loose, or corroded plug cap is a common cause of misfiring and intermittent ignition faults.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Inspect the cap at every service interval and replace immediately if any cracks, carbon tracking, or play at the plug connection are visible.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.866700\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStyle:\u003c\/strong\u003e Red, short cap — standard EVO production specification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eA plug cap is a cheap fix for a symptom that mimics much more expensive ignition faults. CMC Karting stocks the cap alongside the full Rotax 125 MAX EVO ignition parts line.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938979987677,"sku":"R.866700","price":43.69,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-spark-plug-ngk-gr8di","title":"14. 298102 Rotax 125 MAX EVO Spark Plug NGK GR8DI – Standard","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Spark Plug NGK GR8DI\u003c\/strong\u003e (R.298102) is the OEM standard spark plug for all current Rotax 125 MAX EVO engines in serial production. This iridium-tipped NGK plug is the factory-specified heat range for normal racing conditions across all 125 MAX EVO classes — Senior, Junior, Mini, and Micro MAX. The iridium centre electrode provides consistent ignitability and extended service life compared to standard copper-tipped plugs.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Replace at each engine rebuild or at the interval specified by your Rotax service schedule. If running in consistently hot conditions, consider the one-step-colder GR9DI (R.298103).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.298102\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNGK Part Number:\u003c\/strong\u003e GR8DI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Iridium, standard heat range — EVO serial production specification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAlways use a new plug at every rebuild — a fresh plug is the cheapest insurance in your engine. CMC Karting stocks both the standard GR8DI and optional GR9DI Rotax spark plugs.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980020445,"sku":"R.298102","price":29.5,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-spark-plug-ngk-gr9di","title":"14. 298103 Rotax 125 MAX EVO Spark Plug NGK GR9DI – Optional","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Spark Plug NGK GR9DI\u003c\/strong\u003e (R.298103) is the optional one-step-colder iridium spark plug for the Rotax 125 MAX EVO engine. The GR9DI runs one heat range colder than the standard GR8DI (R.298102) and is used in conditions where the engine runs hotter than normal — such as high-ambient-temperature events, longer track sessions, or higher-output engine builds. Using a colder plug in these conditions reduces the risk of pre-ignition while maintaining clean combustion.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. This is an optional spec — the GR8DI is the standard production plug. Only use the GR9DI when your engine builder or Rotax service documentation recommends it for your specific conditions.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.298103\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNGK Part Number:\u003c\/strong\u003e GR9DI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Iridium, one heat range colder than standard — optional specification\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eNot sure which heat range to run? The GR8DI is correct for most conditions. CMC Karting stocks both Rotax-spec NGK plugs so you can choose based on your conditions.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980053213,"sku":"R.298103","price":29.5,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-lock-nut-m6","title":"15. 842041 Rotax 125 MAX EVO Lock Nut M6","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Lock Nut M6\u003c\/strong\u003e (R.842041) is the OEM Grade 6.6 nylon-insert lock nut used throughout the Rotax 125 MAX EVO engine assembly, including as part of the ignition coil mounting hardware. This M6 nylock nut is specified across multiple chapters of the Rotax parts catalog — ignition coil bracket, E-RAVE system, and other mounting points — making it one of the most commonly needed OEM fasteners in the Rotax electrical and engine system.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.842041\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M6, Grade 6.6, Nylon Insert Lock Nut\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eKeep a handful of these in your parts kit — they're used in multiple locations across the engine and are not reusable once the nylon insert is compressed. CMC Karting carries the full Rotax OEM fastener line.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980085981,"sku":"R.842041","price":0.99,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-battery-clamp","title":"17. 251129 Rotax 125 MAX EVO Battery Clamp","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Battery Clamp\u003c\/strong\u003e (R.251129) is the OEM battery holder and mounting cage for the Rotax 125 MAX EVO electrical system. This clamp secures the 12V battery (R.265516) to the kart chassis and includes an additional P-clamp mounting point for routing the wiring harness. The battery clamp is the foundation of the Rotax EVO electrical system mounting — it positions the battery correctly and provides the structural anchor for the battery cover (R.201602) and fixation kit (R.481380).\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Attaches to the kart chassis via pipe clamps (R.251254 set, R.251360 clamp) onto the frame rail.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.251129\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Battery clamp with additional P-clamp mounting point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks the battery clamp along with the full Rotax battery mounting system — pipe clamps, battery fixation kit, battery cover, and the battery itself.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980118749,"sku":"R.251129","price":96.79,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-sheet-nut-m5","title":"18. 842680 Rotax 125 MAX EVO Sheet Nut M5","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Sheet Nut M5\u003c\/strong\u003e (R.842680) is the OEM M5 blind nut used in the battery clamp and electrical assembly mounting on all Rotax 125 MAX EVO engines. Two of these sheet nuts are used in the Ch. 6 electrical assembly, providing threaded anchor points for the M5x12 Allen Bolts (R.640542) that secure the starter relay. This fastener also appears in other locations throughout the engine assembly.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.842680\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M5, Sheet Nut \/ Blind Nut\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 2 per electrical assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks OEM Rotax fasteners so your electrical assembly goes back together with the correct hardware every time.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980217053,"sku":"R.842680","price":3.78,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-starter-relay-assembly","title":"19. 992819 Rotax 125 MAX EVO Starter Relay Assembly","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Starter Relay Assembly\u003c\/strong\u003e (R.992819) is the OEM solenoid relay that controls power delivery to the electric starter motor on all Rotax 125 MAX EVO engines. When the multiple function switch (R.264854) is pressed to start, the relay closes to send full battery current to the starter motor. A faulty relay is a common cause of no-crank conditions — the engine will click but the starter won't engage, or the starter won't respond at all despite a charged battery.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Mounted to the battery clamp (R.251129) via two M5x12 Allen Bolts (R.640542) and two M5 Sheet Nuts (R.842680).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.992819\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe starter relay is an inexpensive part relative to a tow home. Keep one in your spares bag. CMC Karting stocks the full Rotax starter system including the relay, starter assembly, rebuild kit, and cable.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980249821,"sku":"R.992819","price":84.3,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-allen-screw-m5x12","title":"20. 640542 Rotax 125 MAX EVO Allen Screw M5x12 – Relay Mount","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Allen Screw M5x12\u003c\/strong\u003e (R.640542) is the OEM ISO 4762 Grade 8.8 socket head cap screw used to mount the starter relay assembly (R.992819) to the battery clamp on all Rotax 125 MAX EVO engines. Two of these M5x12 bolts are required for the relay mount. This fastener also appears in other locations within the engine assembly.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.640542\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M5 x 12mm, ISO 4762, Grade 8.8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 2 per relay mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks OEM Rotax hardware so your electrical system assembly goes back together correctly.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980282589,"sku":"R.640542","price":1.13,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-junior-max-evo-ecu","title":"22. 666813 Rotax Junior MAX EVO ECU – Electronic Control Unit","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Junior MAX EVO Electronic Control Unit (ECU)\u003c\/strong\u003e (R.666813) is the OEM ignition and engine management module specifically programmed for the \u003cstrong\u003e125 Junior MAX EVO\u003c\/strong\u003e class. The Rotax ECU controls ignition timing, RAVE power valve operation, and engine limiting functions based on the Junior MAX class specification. This ECU is class-specific and \u003cstrong\u003enot interchangeable\u003c\/strong\u003e with the Senior MAX (R.666815) or Mini MAX (R.666818) ECUs — using the wrong ECU will result in incorrect ignition timing and may fail technical inspection.\u003c\/p\u003e\n\n\u003cp\u003eFits: \u003cstrong\u003eRotax 125 Junior MAX EVO only\u003c\/strong\u003e. Mounts to the battery clamp assembly via the rubber pad (R.201900) and sheet nut (R.242141). The ECU is connected via the wiring harness (R.666836) and should be replaced only when confirmed faulty by a Rotax-authorized service center or the Rotax harness tester tool (R.276231).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.666813\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Junior MAX EVO ONLY\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eBefore replacing the ECU, test with the Rotax wiring harness tester to confirm the ECU is the fault source. CMC Karting stocks all three Rotax MAX EVO ECU variants — Junior, Senior\/Micro, and Mini MAX.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980315357,"sku":"R.666813","price":259.22,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-senior-micro-max-evo-ecu","title":"22. 666815 Rotax Senior \u0026 Micro MAX EVO ECU – Electronic Control Unit","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Senior MAX \/ Micro MAX EVO Electronic Control Unit (ECU)\u003c\/strong\u003e (R.666815) is the OEM ignition and engine management module programmed for both the \u003cstrong\u003e125 Senior MAX EVO\u003c\/strong\u003e and \u003cstrong\u003e125 Micro MAX EVO\u003c\/strong\u003e classes. The ECU controls ignition timing, RAVE power valve operation (Senior), and engine limiting functions according to the Senior\/Micro MAX class specification. This module is \u003cstrong\u003enot interchangeable\u003c\/strong\u003e with the Junior MAX (R.666813) or Mini MAX (R.666818) ECUs.\u003c\/p\u003e\n\n\u003cp\u003eFits: \u003cstrong\u003eRotax 125 Senior MAX EVO and Rotax 125 Micro MAX EVO\u003c\/strong\u003e. Mounts to the battery clamp assembly and connects via the wiring harness (R.666836). Always confirm the fault is in the ECU using the Rotax harness tester (R.276231) before replacement.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.666815\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO AND Rotax 125 Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks all three Rotax MAX EVO ECU variants. If you're unsure which ECU your engine requires, contact us and we'll confirm the correct part for your class.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980348125,"sku":"R.666815","price":259.22,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-mini-max-evo-ecu","title":"22. 666818 Rotax Mini MAX EVO ECU – Electronic Control Unit","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Mini MAX EVO Electronic Control Unit (ECU)\u003c\/strong\u003e (R.666818) is the OEM ignition and engine management module specifically programmed for the \u003cstrong\u003e125 Mini MAX EVO\u003c\/strong\u003e class. The Mini MAX ECU controls ignition timing and engine limiting functions according to the Mini MAX class specification, which differs from both the Junior (R.666813) and Senior\/Micro (R.666815) ECUs. Using the incorrect ECU will result in wrong ignition timing and will fail technical inspection.\u003c\/p\u003e\n\n\u003cp\u003eFits: \u003cstrong\u003eRotax 125 Mini MAX EVO only\u003c\/strong\u003e. Mounts to the battery clamp assembly and connects via the wiring harness (R.666836). Confirm the ECU is faulty using the Rotax harness tester (R.276231) before replacement.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.666818\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Mini MAX EVO ONLY\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks all three Rotax MAX EVO ECU variants so you can source the correct class-specific module for your engine. Contact us if you need help confirming the right part.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980380893,"sku":"R.666818","price":259.22,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-ecu-rubber-pad","title":"23. 201900 Rotax 125 MAX EVO ECU Rubber Pad","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO ECU Rubber Pad\u003c\/strong\u003e (R.201900) is the OEM rubber isolation pad that mounts between the ECU (Electronic Control Unit) and the battery clamp on all Rotax 125 MAX EVO engines. This pad dampens vibration transmission to the ECU, protecting the sensitive electronics from the vibration loads generated by a racing kart engine. A deteriorated or missing rubber pad exposes the ECU to higher vibration levels, which can lead to intermittent electrical faults or premature ECU failure.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants and all three ECU versions (R.666813 Junior, R.666815 Senior\/Micro, R.666818 Mini). Replace when the rubber shows cracks, compression set, or hardening.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.201900\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAn inexpensive part that protects your ECU investment. CMC Karting stocks this alongside the full Rotax 125 MAX EVO electrical mounting hardware line.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980413661,"sku":"R.201900","price":25.31,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-pipe-clamp-set-battery","title":"25. 251254 Rotax 125 MAX EVO Pipe Clamp Set – Battery Bracket 32mm","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Pipe Clamp Set\u003c\/strong\u003e (R.251254) is the OEM frame rail clamp set used to mount the battery clamp assembly (R.251129) to the kart chassis on all Rotax 125 MAX EVO engines. This two-piece set includes the upper and lower clamp components that wrap around the 32mm chassis frame rail and secure the battery tray in the correct position relative to the engine. Two sets are used per battery clamp installation.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Works with the Steel Pipe Clamp (R.251360) as the lower half of the mounting system.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.251254\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e 32mm chassis frame rail\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 2 sets per installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks the full Rotax battery mounting system — clamp set, pipe clamp, battery clamp, fixation kit, and battery cover — for a complete one-stop build.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980446429,"sku":"R.251254","price":24.33,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-steel-pipe-clamp-battery","title":"26. 251360 Rotax 125 MAX EVO Steel Pipe Clamp – Battery Mount","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Steel Pipe Clamp\u003c\/strong\u003e (R.251360) is the OEM lower steel frame clamp used in the battery mounting system on all Rotax 125 MAX EVO engines. This clamp forms the lower half of the chassis mounting assembly, pairing with the Pipe Clamp Set (R.251254) to grip the 32mm frame rail and anchor the battery clamp (R.251129) securely. Two of these steel clamps are used per battery mount installation.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.251360\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 2 per installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks this alongside the full Rotax battery mounting hardware so you can complete the entire installation with OEM parts in one order.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980479197,"sku":"R.251360","price":8.56,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-multiple-function-switch","title":"27. 264854 Rotax 125 MAX EVO Multiple Function Switch – Start\/Stop Button","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Multiple Function Switch\u003c\/strong\u003e (R.264854) is the OEM combined start\/stop button assembly for all Rotax 125 MAX EVO engines. This handlebar-mounted switch performs two critical functions: pressing it starts the engine via the electric starter, and holding it cuts the ignition to stop the engine. The multiple function switch is one of the most handled components on a Rotax EVO kart and is a common wear item — a faulty switch is often the cause of intermittent no-start or no-stop conditions before any electrical fault is suspected.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Connects to the wiring harness (R.666836) and is a direct plug-and-play replacement.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.264854\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Combined start\/stop switch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe multiple function switch is a logical first step in diagnosing intermittent start or stop issues before moving to more expensive components. CMC Karting keeps these in stock for fast turnaround.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980511965,"sku":"R.264854","price":77.24,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-battery-12v-6-5ah","title":"29. 265516 Rotax 125 MAX EVO Battery 12V 6.5Ah","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Battery 12V 6.5Ah\u003c\/strong\u003e (R.265516) is the OEM lead-acid AGM battery that powers the electric starter and ECU on all Rotax 125 MAX EVO engines. This sealed, maintenance-free battery delivers reliable cranking current in the compact form factor required by the Rotax battery clamp (R.251129). It ships unfilled (dry-charged) and must be filled with electrolyte and charged before first use. Note: this battery \u003cstrong\u003ecannot be shipped via airfreight\u003c\/strong\u003e due to dangerous goods regulations.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Secured in the battery clamp with the Battery Fixation Kit (R.481380) and covered by the Battery Cover (R.201602). Charge with the Rotax Battery Charger (R.265148 or R.581320).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.265516\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 6.5Ah\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShips:\u003c\/strong\u003e Unfilled\/dry-charged — must be filled and charged before use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Cannot ship via airfreight (dangerous goods)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eA weak or failing battery is a common cause of slow cranking and hard starts. CMC Karting stocks the OEM Rotax battery along with the Battery Fixation Kit and cover for a complete battery installation.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980544733,"sku":"R.265516","price":115.9,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-battery-fixation-kit","title":"30. 481380 Rotax 125 MAX EVO Battery Fixation Kit","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Battery Fixation Kit\u003c\/strong\u003e (R.481380) is the OEM hardware set that secures the battery (R.265516) within the battery clamp (R.251129) on all Rotax 125 MAX EVO engines. This kit provides the straps, hardware, or retention components needed to hold the battery firmly in position during racing, preventing the battery from shifting and stressing the electrical connections at the flat connectors (R.864950).\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.481380\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks the full Rotax battery mounting system — clamp, fixation kit, cover, and flat connectors — for a complete OEM installation.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980872413,"sku":"R.481380","price":9.59,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-flat-battery-connector","title":"31. 864950 Rotax 125 MAX EVO Flat Battery Connector Tab","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Flat Battery Connector\u003c\/strong\u003e (R.864950) is the OEM terminal connector tab used to connect the wiring harness leads to the battery terminals on all Rotax 125 MAX EVO engines. Two flat connectors are used per engine — one at each battery terminal. These connectors are a common maintenance item: corrosion, looseness, or damage to the flat connector is one of the first things to check when diagnosing electrical faults, intermittent starts, or erratic ECU behaviour on a Rotax EVO.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.864950\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 2 per engine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAt under $1 each, flat connectors are the cheapest item to replace in an electrical fault diagnosis. CMC Karting stocks these alongside the full Rotax battery mounting and electrical parts line.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980905181,"sku":"R.864950","price":0.9,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-battery-cover","title":"32. 201602 Rotax 125 MAX EVO Battery Cover","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Battery Cover\u003c\/strong\u003e (R.201602) is the OEM plastic cover that protects the battery and its connections on all Rotax 125 MAX EVO engines. The cover snaps over the battery clamp assembly and shields the battery terminals, flat connectors, and wiring harness connections from debris, water ingress, and accidental shorting. A cracked or missing battery cover leaves the battery exposed and is a common technical inspection failure point at sanctioned events.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e. Secured with an M6x20 button head bolt (R.440761) and M6 O-ring (R.831929).\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.201602\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks the battery cover alongside the full Rotax battery mounting system — clamp, fixation kit, flat connectors, and the securing hardware.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980937949,"sku":"R.201602","price":63.84,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-button-head-bolt-m6x20","title":"34. 440761 Rotax 125 MAX EVO Button Head Bolt M6x20 – Battery Cover","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Button Head Bolt M6x20\u003c\/strong\u003e (R.440761) is the OEM rounded flange head Allen bolt used to secure the battery cover (R.201602) to the battery clamp assembly on all Rotax 125 MAX EVO engines. The rounded flange head provides a low-profile, snag-free fastening point appropriate for the battery cover location. This bolt is also used at the radiator mounting on the Rotax 125 MAX EVO.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.440761\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M6 x 20mm, Allen Screw with Rounded Flange Head\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks OEM Rotax hardware so you always have the correct fastener for reassembly.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938980970717,"sku":"R.440761","price":2.3,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-pick-up-sensor-gasket","title":"35. 431500 Rotax 125 MAX Pick-Up Sensor Gasket – Non-Machined Crankcase","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX Pick-Up Sensor Gasket\u003c\/strong\u003e (R.431500) is the OEM gasket used when mounting the ignition pick-up sensor (R.265560) on older Rotax crankcase versions that have a \u003cstrong\u003enon-machined pick-up sensor flange\u003c\/strong\u003e — those produced before crankcase part number 295915. On these older crankcases, this gasket fills the gap between the pick-up sensor and the unfinished flange surface to ensure a proper seal. It is used together with two Taptite screws (R.941251) instead of the standard Allen Screws (R.241935) used on machined-flange crankcases.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eThis gasket is only required for pre-295915 crankcases with a non-machined pick-up sensor mounting flange.\u003c\/strong\u003e If your crankcase is R.295915 or later, this gasket is not needed.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.431500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Pre-295915 crankcase with non-machined pick-up sensor flange ONLY\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO (legacy crankcases only)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eNot sure if your crankcase needs this gasket? Check your crankcase part number — if it's R.295915 or newer, you don't need this part. CMC Karting stocks it for older engine rebuilds.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938981232861,"sku":"R.431500","price":4.19,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-harness-cable-clamp-m6","title":"36. 851492 Rotax 125 MAX EVO Wiring Harness Cable Clamp 15\/M6","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Cable Clamp 15\/M6\u003c\/strong\u003e (R.851492) is the OEM rubber-coated cable clamp used to secure the wiring harness to the battery holder on all Rotax 125 MAX EVO engines. This P-style clamp keeps the harness routed correctly and protected from abrasion against the chassis, preventing chafing damage to the wiring loom over time. It is secured with the M6x10 Allen Bolt (R.241081).\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.851492\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 15mm \/ M6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Rubber-coated P-clamp for wiring harness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks this clamp with the R.241081 mounting bolt so you can source both in one order.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938981265629,"sku":"R.851492","price":8.06,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-max-allen-screw-m6x10-harness","title":"37. 241081 Rotax 125 MAX EVO Allen Screw M6x10 – Harness Clamp","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 MAX EVO Allen Screw M6x10\u003c\/strong\u003e (R.241081) is the OEM DIN 912 socket head cap screw used to secure the wiring harness cable clamp (R.851492) to the battery holder on all Rotax 125 MAX EVO engines. This short M6x10 bolt is the correct fastener for the harness clamp mounting point and should not be substituted with a longer bolt, which could interfere with the battery holder structure.\u003c\/p\u003e\n\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eSenior MAX EVO, Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.241081\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M6 x 10mm, DIN 912\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCMC Karting stocks this alongside the wiring harness cable clamp (R.851492) for a complete harness routing hardware set.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":47938981331165,"sku":"R.241081","price":0.9,"currency_code":"USD","in_stock":true}]}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0731\/6770\/0189\/collections\/CMC_ROTAX_MAX_ELECTRONIC_COMPONENTS.png?v=1779734465","url":"https:\/\/cmckarting.com\/collections\/rotax-max-wiring-harness-ignition-parts-new-style.oembed?page=2","provider":"CMC Karting","version":"1.0","type":"link"}