{"product_id":"rotax-junior-max-evo-ecu","title":"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}],"url":"https:\/\/cmckarting.com\/products\/rotax-junior-max-evo-ecu","provider":"CMC Karting","version":"1.0","type":"link"}