{"title":"Rotax Max Head \u0026 Cylinder Parts","description":"","products":[{"product_id":"rotax-max-cylinder-base-gasket-0-3mm","title":"1. 650480 Rotax Max Cylinder Base Gasket 0.3mm","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Base Gasket 0.3mm\u003c\/strong\u003e (R.650480) is the OEM paper gasket used between the cylinder and crankcase on all Rotax 125 MAX EVO engines. The standard squish clearance setting for most Rotax 125 MAX EVO builds in typical conditions. Base gasket thickness selection is one of the primary methods used to tune squish clearance on the Rotax 125 MAX EVO — changing the base gasket directly affects the distance between the piston crown and cylinder head at TDC, which influences combustion efficiency and power characteristics. All four standard thicknesses are included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO cylinders: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Always replace the base gasket at every cylinder removal — a reused base gasket will not seal reliably.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.650480\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 0.3mm\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\u003cp\u003eCMC Karting stocks all five Rotax base gasket thicknesses so you can select the correct clearance for your build. Also available as part of the Cylinder Gasket Set (R.296161).\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168037581021,"sku":"R.650480","price":9.55,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-base-gasket-0-5mm","title":"1. 650481 Rotax Max Cylinder Base Gasket 0.5mm","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Base Gasket 0.5mm\u003c\/strong\u003e (R.650481) is the OEM paper gasket used between the cylinder and crankcase on all Rotax 125 MAX EVO engines. A mid-range base gasket thickness used to adjust squish height for specific piston sizes or engine configurations. Base gasket thickness selection is one of the primary methods used to tune squish clearance on the Rotax 125 MAX EVO — changing the base gasket directly affects the distance between the piston crown and cylinder head at TDC, which influences combustion efficiency and power characteristics. All four standard thicknesses are included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO cylinders: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Always replace the base gasket at every cylinder removal — a reused base gasket will not seal reliably.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.650481\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 0.5mm\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\u003cp\u003eCMC Karting stocks all five Rotax base gasket thicknesses so you can select the correct clearance for your build. Also available as part of the Cylinder Gasket Set (R.296161).\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168037712093,"sku":"R.650481","price":9.55,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-base-gasket-0-8mm","title":"1. 650482 Rotax Max Cylinder Base Gasket 0.8mm","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Base Gasket 0.8mm\u003c\/strong\u003e (R.650482) is the OEM paper gasket used between the cylinder and crankcase on all Rotax 125 MAX EVO engines. The thickest standard base gasket, used to reduce compression ratio or accommodate larger piston sizes. Base gasket thickness selection is one of the primary methods used to tune squish clearance on the Rotax 125 MAX EVO — changing the base gasket directly affects the distance between the piston crown and cylinder head at TDC, which influences combustion efficiency and power characteristics. All four standard thicknesses are included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO cylinders: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Always replace the base gasket at every cylinder removal — a reused base gasket will not seal reliably.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.650482\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 0.8mm\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\u003cp\u003eCMC Karting stocks all five Rotax base gasket thicknesses so you can select the correct clearance for your build. Also available as part of the Cylinder Gasket Set (R.296161).\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168037843165,"sku":"R.650482","price":9.55,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-base-gasket-0-4mm","title":"1. 650483 Rotax Max Cylinder Base Gasket 0.4mm","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Base Gasket 0.4mm\u003c\/strong\u003e (R.650483) is the OEM paper gasket used between the cylinder and crankcase on all Rotax 125 MAX EVO engines. An intermediate thickness option for precise squish clearance adjustment between the 0.3mm and 0.5mm gaskets. Base gasket thickness selection is one of the primary methods used to tune squish clearance on the Rotax 125 MAX EVO — changing the base gasket directly affects the distance between the piston crown and cylinder head at TDC, which influences combustion efficiency and power characteristics. All four standard thicknesses are included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO cylinders: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Always replace the base gasket at every cylinder removal — a reused base gasket will not seal reliably.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.650483\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 0.4mm\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\u003cp\u003eCMC Karting stocks all five Rotax base gasket thicknesses so you can select the correct clearance for your build. Also available as part of the Cylinder Gasket Set (R.296161).\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168037908701,"sku":"R.650483","price":9.55,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-base-gasket-0-2mm","title":"1. 431337 Rotax Max Cylinder Base Gasket 0.2mm – Race Only","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Base Gasket 0.2mm (Race Only)\u003c\/strong\u003e (R.431337) is the OEM paper gasket used between the cylinder and crankcase on all Rotax 125 MAX EVO engines. The thinnest available base gasket, approved for racing use only. Requires Silicone Compound Grease 897061 on both faces to ensure proper sealing — do not use dry. Base gasket thickness selection is one of the primary methods used to tune squish clearance on the Rotax 125 MAX EVO — changing the base gasket directly affects the distance between the piston crown and cylinder head at TDC, which influences combustion efficiency and power characteristics. All four standard thicknesses are included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO cylinders: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Always replace the base gasket at every cylinder removal — a reused base gasket will not seal reliably.\n\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e This gasket requires Silicone Compound Grease (R.897061) applied to both faces for proper sealing. Approved for racing use only.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.431337\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 0.2mm (Race 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\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks all five Rotax base gasket thicknesses so you can select the correct clearance for your build. Also available as part of the Cylinder Gasket Set (R.296161).\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038007005,"sku":"R.431337","price":9.55,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-senior-max-cylinder-nisic-2025","title":"2. 413531-R Rotax 125 Senior MAX Cylinder NiSiC – 2025","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 Senior MAX EVO Cylinder NiSiC\u003c\/strong\u003e (R.413531-R) is the current 2025-specification OEM nikasil-plated cylinder for the Rotax 125 Senior MAX EVO engine. This revised cylinder features the Single Core Digital Print identification marking required for the current season's technical compliance and replaces the previous R.613372 cylinder. The NiSiC (Nickel Silicon Carbide) bore plating provides exceptional wear resistance and heat transfer, maintaining precise bore geometry through thousands of race hours when correctly maintained.\u003c\/p\u003e\n\u003cp\u003eFits: \u003cstrong\u003eRotax 125 Senior MAX EVO\u003c\/strong\u003e only. The Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO use the smaller displacement cylinder (R.413530-R). This cylinder must be used with the correct base gasket thickness (R.650480–R.650483, R.431337) to achieve Rotax-specified squish clearance.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.413531-R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e NiSiC plated, Single Core Digital Print, 2025 spec\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces:\u003c\/strong\u003e R.613372 (previous Senior MAX cylinder)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the current 2025-spec Senior MAX cylinder alongside matching base gaskets, collar nuts, and cylinder head components for a complete top-end build.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038105309,"sku":"R.413531-R","price":790.93,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-125-junior-mini-micro-max-cylinder-nisic-2025","title":"2. 413530-R Rotax 125 Junior Mini Micro MAX Cylinder NiSiC – 2025","description":"\u003cp\u003eThe \u003cstrong\u003eRotax 125 Junior\/Mini\/Micro MAX EVO Cylinder NiSiC\u003c\/strong\u003e (R.413530-R) is the current 2025-specification OEM nikasil-plated cylinder shared by the Rotax 125 Junior MAX EVO, Mini MAX EVO, and Micro MAX EVO engines. This revised cylinder features the Single Core Digital Print identification marking required for current technical compliance and replaces the previous R.223991 cylinder. The NiSiC bore plating provides the same exceptional wear characteristics as the Senior MAX cylinder, with the porting specification appropriate for the reduced power output required by these class configurations.\u003c\/p\u003e\n\u003cp\u003eFits: \u003cstrong\u003eRotax 125 Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. The Senior MAX EVO uses the larger cylinder (R.413531-R). This cylinder must be paired with the correct intake or exhaust restrictors as required by each class technical specification.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.413530-R\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e NiSiC plated, Single Core Digital Print, 2025 spec\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces:\u003c\/strong\u003e R.223991 (previous Jr\/Mini\/Micro cylinder)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the current 2025-spec Junior\/Mini\/Micro MAX cylinder alongside matching base gaskets and top-end rebuild components.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038170845,"sku":"R.413530-R","price":749.48,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-collar-nut-m8","title":"3. 242707 Rotax Max Cylinder Collar Nut M8","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Collar Nut M8\u003c\/strong\u003e (R.242707) is the OEM flanged collar nut used to secure the cylinder to the crankcase studs on all Rotax 125 MAX EVO engines, tightened to 24 Nm in a cross pattern. Four of these nuts are used per engine — one on each cylinder stud. The flanged collar design provides a larger bearing surface than a standard hex nut, distributing clamping force evenly around the cylinder base flange to ensure uniform compression of the base gasket. Using incorrect nuts or incorrect torque on these fasteners causes cylinder tilt, base gasket leaks, and cylinder bore distortion.\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.242707\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e M8, Collar Flange Nut\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTightening Torque:\u003c\/strong\u003e 24 Nm, cross pattern\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 4 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\u003cp\u003eCMC Karting stocks these alongside cylinder studs and all Rotax 125 MAX EVO top-end fasteners.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038236381,"sku":"R.242707","price":8.87,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-head-o-ring-64x2","title":"4. 250160 Rotax Max Cylinder Head O-Ring 64x2 FPM","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Head O-Ring 64x2 FPM\u003c\/strong\u003e (R.250160) is the OEM large fluorocarbon (FPM\/Viton) o-ring that seals the combustion chamber insert (R.223386) to the cylinder head on all Rotax 125 MAX EVO engines. This o-ring operates directly adjacent to the combustion chamber and must withstand extreme heat and combustion pressure — the FPM (Viton) compound is specifically selected for its high-temperature resistance compared to standard NBR rubber. A leaking or deteriorated large head o-ring causes combustion gas leakage, power loss, and can allow coolant to enter the combustion chamber. Also included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Always replace at every cylinder head or combustion chamber insert removal.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.250160\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 64 x 2mm, FPM 75 (Viton)\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\u003cp\u003eCMC Karting stocks this o-ring individually and as part of the Cylinder Gasket Set (R.296161).\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038301917,"sku":"R.250160","price":9.59,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-combustion-chamber-insert","title":"5. 223386 Rotax Max Combustion Chamber Insert","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Combustion Chamber Insert\u003c\/strong\u003e (R.223386) is the OEM precision-machined insert that defines the combustion chamber volume and shape in the Rotax 125 MAX EVO cylinder head. This insert is a sealed, scrutineered component at Rotax Challenge events — its dimensions directly determine compression ratio and combustion chamber geometry, so it must be present, unmodified, and correctly seated for technical compliance. The insert is retained in the cylinder head by the large head o-ring (R.250160) and is a replacement item when the head is damaged or when a fresh combustion chamber surface is needed.\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Sealed at the head face by the large o-ring (R.250160) and at the smaller port by o-ring R.430782.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e[VERIFY]\u003c\/strong\u003e Your price sheet marks this part \"Pre 2025\" — confirm with your Rotax distributor whether R.223386 is still the current production part number or if an updated combustion chamber insert has been issued for 2025-spec cylinders.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.223386\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\u003cp\u003eCMC Karting stocks the Rotax combustion chamber insert alongside the cylinder head components and full top-end rebuild parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038334685,"sku":"R.223386","price":127.05,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-head-bolt-m8x30","title":"7. 940487 Rotax Max Cylinder Head Bolt M8x30 Grade 10.9","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Head Bolt M8x30 Grade 10.9\u003c\/strong\u003e (R.940487) is the OEM high-tensile ISO 4017 hex bolt used to clamp the cylinder head to the cylinder on all Rotax 125 MAX EVO engines, tightened to 30 Nm in a cross pattern. Five of these bolts are used per engine. Grade 10.9 is specified for this application — do not substitute with Grade 8.8 bolts, which lack the yield strength required at 30 Nm in repeated thermal cycling. Used with Lock Washer DIN 128-A8 (R.945832) at each bolt position.\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.940487\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M8 x 30mm, ISO 4017, Grade 10.9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTightening Torque:\u003c\/strong\u003e 30 Nm, cross pattern\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 5 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\u003cp\u003eCMC Karting stocks the cylinder head bolts alongside lock washers and the full Rotax 125 MAX EVO cylinder head hardware set.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038400221,"sku":"R.940487","price":2.21,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-head-o-ring-23-3x2-4","title":"8. 430782 Rotax Max Cylinder Head O-Ring 23.3x2.4 MVQ","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Head Small O-Ring 23.3x2.4 MVQ 60\u003c\/strong\u003e (R.430782) is the OEM silicone (MVQ) o-ring that seals the smaller port of the combustion chamber insert in the Rotax 125 MAX EVO cylinder head. The MVQ (silicone rubber) compound provides excellent resistance to both high combustion temperatures and coolant contact, making it ideal for this demanding sealing location. A deteriorated small head o-ring allows combustion gas bypass or coolant ingress through the insert port, causing misfiring, coolant contamination, or cylinder head damage. Also included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Replace at every cylinder head or combustion chamber insert service.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.430782\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 23.3 x 2.4mm, MVQ 60 (Silicone)\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\u003cp\u003eCMC Karting stocks this alongside the large head o-ring (R.250160) and combustion chamber insert for a complete head service.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038432989,"sku":"R.430782","price":7.02,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-head-cover-o-ring-105x2-5","title":"9. 250280 Rotax Max Cylinder Head Cover O-Ring 105x2.5","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Head Cover O-Ring 105x2.5 NBR\u003c\/strong\u003e (R.250280) is the OEM large outer o-ring that seals the cylinder head cover (R.613101\/R.613103\/R.613104) to the cylinder head on all Rotax 125 MAX EVO engines. This o-ring seals the coolant jacket at the top of the cylinder, preventing coolant leakage at the head cover joint. A leaking head cover o-ring causes coolant loss, wet cylinder head covers, and can allow air into the cooling circuit causing hot spots and overheating. Also included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Replace at every head cover removal.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.250280\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 105 x 2.5mm, NBR 70\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\u003cp\u003eCMC Karting stocks this alongside the cylinder head cover variants and full Rotax cylinder head sealing set.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038531293,"sku":"R.250280","price":9.05,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-head-cover","title":"10. Rotax Max Cylinder Head Cover – Standard, Black \u0026 Red","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Head Cover\u003c\/strong\u003e  is the OEM water jacket cover that seals the top of the Rotax 125 MAX EVO cylinder head, enclosing the coolant passage above the combustion chamber. The head cover contains the coolant outlet port and, on thermostat-equipped versions, the thermostat housing that regulates coolant flow to the radiator. Available in three configurations: \u003cstrong\u003eStandard (R.613101)\u003c\/strong\u003e without thermostat port, \u003cstrong\u003eBlack (R.613103)\u003c\/strong\u003e with thermostat port and black anodising, and \u003cstrong\u003eRed (R.613104)\u003c\/strong\u003e with thermostat port and red anodising — black and red are functionally identical, differing only in colour. Sealed to the cylinder head by the large outer o-ring (R.250280). Secured with three M6x16 Allen Screws (R.241237) and one sealing Allen Screw M6x25 (R.641361).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Select your preferred version from the dropdown.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Numbers:\u003c\/strong\u003e R.613101 (Standard) \/ R.613103 (Black) \/ R.613104 (Red)\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\u003cp\u003eCMC Karting stocks all three Rotax head cover variants alongside the head cover o-ring, thermostat assembly, and full cylinder head rebuild parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Standard – Without Thermostat (R.613101)","offer_id":48168038662365,"sku":"R.613101","price":116.93,"currency_code":"USD","in_stock":true},{"title":"Black – With Thermostat Port (R.613103)","offer_id":48168038695133,"sku":"R.613103","price":125.83,"currency_code":"USD","in_stock":true},{"title":"Red – With Thermostat Port (R.613104)","offer_id":48168038727901,"sku":"R.613104","price":125.83,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-thermostat-45-degrees","title":"11. 222125 Rotax Max Thermostat 45 Degrees","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Thermostat 45 Degrees\u003c\/strong\u003e (R.222125) is the OEM wax-element thermostat used in the Rotax 125 MAX EVO cylinder head cover cooling circuit. Opening at 45°C, this thermostat regulates coolant flow to the radiator — it remains closed when the engine is cold to accelerate warm-up, then opens progressively to allow coolant to circulate through the radiator as operating temperature is reached. A stuck-closed thermostat causes overheating; a stuck-open thermostat causes the engine to run too cold and struggle to reach optimal operating temperature, both of which degrade performance and engine longevity.\u003c\/p\u003e\n\u003cp\u003eCompatible with the thermostat-equipped head covers (R.613103 Black, R.613104 Red) on all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Housed in the Thermostat Holder (R.222175) and retained by the Thermostat Retaining Bracket (R.222202).\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.222125\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpening Temperature:\u003c\/strong\u003e 45°C\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 (with thermostat head covers R.613103 or R.613104)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the thermostat alongside the holder, retaining bracket, and spring for a complete thermostat assembly.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038793437,"sku":"R.222125","price":23.26,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-thermostat-holder","title":"11. 222175 Rotax Max Thermostat Holder","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Thermostat Holder\u003c\/strong\u003e (R.222175) is the OEM housing that seats and retains the thermostat (R.222125) within the cylinder head cover on all Rotax 125 MAX EVO engines equipped with the thermostat-style head cover. The holder positions the thermostat correctly in the coolant flow path and provides the seating surface for the thermostat wax element. A cracked or distorted thermostat holder prevents the thermostat from seating correctly, causing uncontrolled coolant bypass and inconsistent temperature regulation.\u003c\/p\u003e\n\u003cp\u003eCompatible with thermostat-equipped head covers (R.613103 Black, R.613104 Red) on all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.222175\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 (with thermostat head covers R.613103 or R.613104)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the thermostat holder alongside the thermostat, spring, and retaining bracket.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038858973,"sku":"R.222175","price":14.05,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-thermostat-compression-spring","title":"11. 239950 Rotax Max Thermostat Compression Spring","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Thermostat Compression Spring\u003c\/strong\u003e (R.239950) is the OEM spring used in the thermostat retaining assembly of the Rotax 125 MAX EVO cylinder head cover. This spring loads the thermostat retaining bracket (R.222202) to hold the thermostat (R.222125) firmly in its seated position within the thermostat holder. A fatigued or missing spring allows the thermostat to unseat under coolant pressure, causing unmetered coolant bypass, erratic temperature control, and ultimately the thermostat to be ejected from its housing under race conditions.\u003c\/p\u003e\n\u003cp\u003eCompatible with thermostat-equipped head covers (R.613103 Black, R.613104 Red) on all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.239950\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 (with thermostat head covers R.613103 or R.613104)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the thermostat spring alongside the complete thermostat assembly parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038891741,"sku":"R.239950","price":7.84,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-thermostat-retaining-bracket","title":"11. 222202 Rotax Max Thermostat Retaining Bracket","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Thermostat Retaining Bracket\u003c\/strong\u003e (R.222202) is the OEM clip that secures the thermostat (R.222125) and its holder (R.222175) in the cylinder head cover on all Rotax 125 MAX EVO engines equipped with the thermostat-style head cover. This small bracket is loaded by the compression spring (R.239950) and snaps into position to prevent thermostat displacement under coolant pressure. A broken or missing retaining bracket allows the thermostat assembly to unseat, causing loss of temperature control and potential internal flooding of the head cover coolant circuit.\u003c\/p\u003e\n\u003cp\u003eCompatible with thermostat-equipped head covers (R.613103 Black, R.613104 Red) on all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.222202\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 (with thermostat head covers R.613103 or R.613104)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the retaining bracket alongside the full Rotax thermostat assembly parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038957277,"sku":"R.222202","price":13.87,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-head-cover-sealing-allen-screw-m6x25","title":"12. 641361 Rotax Max Head Cover Sealing Allen Screw M6x25","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Head Cover Sealing Allen Screw M6x25\u003c\/strong\u003e (R.641361) is the OEM drilled Allen bolt used at one specific position on the cylinder head cover of all Rotax 125 MAX EVO engines, tightened to 10 Nm. Like the sealing stud in the crankcase (R.241387), this bolt features a through-hole for Rotax sealing wire — required at scrutineered events to confirm the head cover has not been removed between technical inspections. Using a standard bolt without the sealing hole at this location will fail engine scrutineering at Rotax Challenge series events.\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Note: this is a different part from R.840866 (M6x25 standard Allen bolt) — the sealing hole makes them non-interchangeable for scrutineered applications.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.641361\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M6 x 25mm, Allen Screw with sealing wire hole\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\u003cp\u003eCMC Karting stocks this sealing bolt alongside the standard head cover Allen screws and full Rotax cylinder head hardware.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039055581,"sku":"R.641361","price":7.57,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-cylinder-head-plug-screw-m10x1","title":"13. 641323 Rotax Max Cylinder Head Plug Screw M10x1","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Cylinder Head Plug Screw M10x1\u003c\/strong\u003e (R.641323) is the OEM DIN 906 hex socket plug screw that seals an access or measurement port in the Rotax 125 MAX EVO cylinder head. This plug seals the port when it is not in use — the port is used during engine setup and scrutineering for combustion chamber volume measurement and compression testing. A missing plug screw allows air or coolant leakage through the port, causing lean running or coolant loss depending on port location.\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.641323\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M10 x 1mm, DIN 906 MK hex socket plug\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\u003cp\u003eCMC Karting stocks this alongside the full Rotax 125 MAX EVO cylinder head hardware set.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039153885,"sku":"R.641323","price":7.02,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-head-cover-allen-screw-m6x16","title":"14. 241237 Rotax Max Head Cover Allen Screw M6x16","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Head Cover Allen Screw M6x16\u003c\/strong\u003e (R.241237) is the OEM ISO 4762 Grade 8.8 socket head cap screw used to secure the cylinder head cover (R.613101\/R.613103\/R.613104) to the cylinder head on all Rotax 125 MAX EVO engines, tightened to 10 Nm. Three of these M6x16 bolts are used per engine alongside the single sealing Allen Screw (R.641361). These are shorter than the standard M6x25 engine bolts — always use the correct length to avoid bottoming out in the head cover bore or insufficient clamping.\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.241237\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification:\u003c\/strong\u003e M6 x 16mm, 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\u003eQuantity Required:\u003c\/strong\u003e 3 per head cover\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\u003cp\u003eCMC Karting stocks these alongside the sealing head cover bolt (R.641361) and full Rotax cylinder head hardware.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039252189,"sku":"R.241237","price":1.67,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-exhaust-socket-37mm","title":"25. 273190 Rotax Max Exhaust Socket 37mm – Senior \u0026 Junior","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Exhaust Socket 37mm\u003c\/strong\u003e (R.273190) is the OEM unrestricted exhaust port socket used on the Rotax 125 Senior MAX EVO, Junior MAX EVO, and DD2 engines. This 37mm bore exhaust socket connects the cylinder exhaust port to the expansion chamber header pipe, providing the primary exhaust gas seal at the cylinder. The 37mm unrestricted bore is the standard specification for Senior and Junior MAX — as opposed to the restricted 18mm (R.273192, Micro MAX) and 22mm (R.273196, Mini MAX) sockets. A leaking or damaged exhaust socket causes exhaust gas escape at the cylinder port, significant power loss, and increased exhaust noise.\u003c\/p\u003e\n\u003cp\u003eFits: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO\u003c\/strong\u003e and Rotax DD2. Sealed with the Exhaust Socket Gasket (R.250271). Also includes the E-RAVE valve port on Senior MAX EVO — this socket hosts both the exhaust pipe connection and the power valve aperture.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.273190\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBore:\u003c\/strong\u003e 37mm, unrestricted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Rotax DD2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the exhaust socket alongside the exhaust socket gasket and the full Rotax 125 MAX EVO exhaust system parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039383261,"sku":"R.273190","price":46.94,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-exhaust-valve-gasket","title":"29. 250231 Rotax Max Exhaust Valve Gasket","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Exhaust Valve Gasket\u003c\/strong\u003e (R.250231) is the OEM sealing gasket used at the exhaust valve (E-RAVE power valve) aperture in the Rotax 125 Senior MAX EVO cylinder. This gasket seals the exhaust valve housing mounting face on the cylinder, preventing hot exhaust gas from escaping around the valve housing perimeter. Replace at every exhaust valve or E-RAVE service — a reused gasket risks exhaust gas leakage that is difficult to detect and causes gradual power loss. Also included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eFits: \u003cstrong\u003eRotax 125 Senior MAX EVO\u003c\/strong\u003e with E-RAVE system only. Not applicable to Junior MAX, Mini MAX, or Micro MAX cylinders.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.250231\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO (E-RAVE \/ power valve cylinder)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks this alongside the E-RAVE power valve assembly and full Rotax exhaust valve service parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039448797,"sku":"R.250231","price":9.59,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-exhaust-socket-gasket","title":"31. 250271 Rotax Max Exhaust Socket Gasket","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Exhaust Socket Gasket\u003c\/strong\u003e (R.250271) is the OEM gasket that seals the exhaust socket (R.273190) to the cylinder on all Rotax 125 MAX EVO engines. This gasket sits between the exhaust socket flange and the cylinder exhaust port face, sealing the high-temperature, high-pressure exhaust gas path at the cylinder. A leaking exhaust socket gasket causes a noticeable exhaust leak sound, power loss, and can cause burning or discoloration of adjacent components from hot gas impingement. Replace at every exhaust socket removal. Also included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.250271\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\u003cp\u003eCMC Karting stocks the exhaust socket gasket alongside the exhaust socket and full Rotax exhaust system parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039547101,"sku":"R.250271","price":9.59,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-reed-valve-assembly","title":"32. 224380 Rotax Max Reed Valve Assembly","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Reed Valve Assembly\u003c\/strong\u003e (R.224380) is the complete OEM inlet reed valve for all current Rotax 125 MAX EVO engines. The reed valve acts as a one-way check valve at the inlet port — it opens under intake vacuum to allow air\/fuel mixture into the crankcase and snaps closed under crankcase pressure to prevent backflow. The performance of the reed valve directly affects power output across the RPM range: worn, fatigued, or cracked reeds cause power loss, poor throttle response, and difficult starting. This is the current production reed valve assembly, replacing the older R.224389 (Pre 2021 version).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Sealed to the cylinder with the Reed Valve Gasket (R.250521). The reed petals (R.224431) are also available separately.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.224380\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces:\u003c\/strong\u003e R.224389 (pre-2021 reed valve)\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\u003cp\u003eInspect your reed valve at every major engine service. CMC Karting stocks the complete reed valve assembly, individual reed petals, and the reed valve gasket.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039645405,"sku":"R.224380","price":117.74,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-reed-petal","title":"34. 224431 Rotax Max Reed Petal","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Reed Petal\u003c\/strong\u003e (R.224431) is the OEM individual reed valve petal for the Rotax 125 MAX EVO inlet reed valve assembly. Two reed petals are used per reed valve assembly — one on each side of the reed cage — and each petal opens and closes thousands of times per second at racing RPM. Reed petals are consumable items that fatigue over time, developing chips at the tips, cracks along the petal length, or a permanent set (failure to close fully) that causes intake backflow. Replace when petals show any visible damage or at regular engine rebuild intervals.\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Replaces individual petals in the Reed Valve Assembly (R.224380). Two petals required per assembly.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.224431\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 2 per reed valve 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\u003cp\u003eCMC Karting stocks individual reed petals alongside the complete reed valve assembly and reed valve gasket.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039743709,"sku":"R.224431","price":22.76,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-reed-valve-gasket","title":"35. 250521 Rotax Max Reed Valve Gasket","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Reed Valve Gasket\u003c\/strong\u003e (R.250521) is the OEM sealing gasket between the reed valve assembly (R.224380) and the cylinder inlet port on all Rotax 125 MAX EVO engines. This gasket seals the inlet tract at the cylinder face, preventing unmetered air from bypassing the reed valve and entering the crankcase. A leaking reed valve gasket causes a lean condition that is difficult to correct with jetting alone and can ultimately lead to engine seizure. Replace at every reed valve removal. Also included in the Engine Gasket Set (R.296160) and Cylinder Gasket Set (R.296161).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.250521\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\u003cp\u003eCMC Karting stocks the reed valve gasket alongside the reed valve assembly and full Rotax 125 MAX EVO engine rebuild parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039842013,"sku":"R.250521","price":0.0,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-micro-mini-max-reed-valve-update-kit","title":"38. 281551 Rotax Micro \u0026 Mini MAX Reed Valve Update Kit","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Micro \u0026amp; Mini MAX Reed Valve Update Kit\u003c\/strong\u003e (R.281551) is the OEM update kit for converting older Micro MAX and Mini MAX EVO engines to the current reed valve specification. This kit contains the updated reed valve components needed to bring an older engine into current technical compliance, ensuring the reed valve assembly matches the specification required for current-season Rotax Challenge scrutineering. As Rotax periodically updates inlet specifications for the younger classes, this kit is the official factory-approved update path.\u003c\/p\u003e\n\u003cp\u003eFits: \u003cstrong\u003eRotax 125 Micro MAX EVO and Mini MAX EVO\u003c\/strong\u003e. Not applicable to Senior MAX or Junior MAX engines.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.281551\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Micro MAX EVO and Mini MAX EVO only\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the Micro\/Mini MAX reed valve update kit alongside individual reed valve components and complete engine gasket sets.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168039907549,"sku":"R.281551","price":22.54,"currency_code":"USD","in_stock":true}]},{"product_id":"rotax-max-gasket-set-cylinder-assembly","title":"50. 296161 Rotax Max Gasket Set Cylinder Assembly","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Gasket Set Cylinder Assembly\u003c\/strong\u003e (R.296161) is the OEM cylinder-specific gasket kit for the Rotax 125 MAX EVO engine, containing all the seals and gaskets needed for a cylinder and head rebuild — without the crankcase or gearbox seals included in the full Engine Gasket Set (R.296160). This kit is the right choice when only the top end is being rebuilt and the crankcase is not being opened. It contains: the two cylinder head o-rings (R.250160 and R.430782), head cover o-ring (R.250280), exhaust valve gasket (R.250231), exhaust socket gasket (R.250271), reed valve gasket (R.250521), all four standard base gaskets (0.3\/0.4\/0.5\/0.8mm), and two piston circlips (R.945635).\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. For a complete engine rebuild including crankcase seals and gearbox gasket, use the full Engine Gasket Set (R.296160).\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.296161\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContents:\u003c\/strong\u003e All gaskets and o-rings for a complete Rotax 125 MAX EVO cylinder and head rebuild\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\u003cp\u003eCMC Karting stocks both the Cylinder Gasket Set (R.296161) for top-end work and the full Engine Gasket Set (R.296160) for complete engine rebuilds.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168040005853,"sku":"R.296161","price":74.39,"currency_code":"USD","in_stock":true}]}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0731\/6770\/0189\/collections\/CMC_Rotax_Max_Head_Cylinder_Parts.png?v=1779734858","url":"https:\/\/cmckarting.com\/collections\/rotax-max-head-cylinder-parts.oembed?page=2","provider":"CMC Karting","version":"1.0","type":"link"}