{"product_id":"rotax-max-piston-assembly","title":"22. Rotax Max Piston Assembly 53.92mm to 53.98mm","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Piston Assembly\u003c\/strong\u003e is the complete OEM piston for the Rotax 125 MAX EVO engine, supplied with the piston pin, wrist pin circlips (R.945635), and piston ring pre-installed. Available in seven diameter grades from \u003cstrong\u003e53.92mm to 53.98mm\u003c\/strong\u003e in 0.01mm increments, allowing precise cylinder-to-piston clearance matching during engine rebuild. The correct piston size is determined by measuring the cylinder bore and selecting the piston that achieves the Rotax-specified running clearance — using the wrong size piston risks seizure (too tight) or excessive blow-by and power loss (too loose).\u003c\/p\u003e\n\u003cp\u003eSizes 53.92mm and 53.93mm are the smaller-spec pistons; 53.94mm–53.96mm are standard grade; 53.97mm and 53.98mm are oversize. Compatible 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. Requires the Wrist Pin Needle Cage Bearing (R.932027) and Wrist Pin (R.216135), sold separately.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Numbers:\u003c\/strong\u003e R.295509 (53.92mm) through R.295515 (53.98mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Piston, piston pin, piston ring, and 2 circlips\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\u003eMeasure your cylinder before ordering. CMC Karting stocks all seven piston grades alongside the wrist pin bearing and complete Rotax 125 MAX EVO top-end rebuild parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"53.92mm – Smaller (R.295509)","offer_id":48168085455069,"sku":"R.295509","price":144.69,"currency_code":"USD","in_stock":true},{"title":"53.93mm – Smaller (R.295510)","offer_id":48168085487837,"sku":"R.295510","price":144.69,"currency_code":"USD","in_stock":true},{"title":"53.94mm – Standard (R.295511)","offer_id":48168085520605,"sku":"R.295511","price":144.69,"currency_code":"USD","in_stock":true},{"title":"53.95mm – Standard (R.295512)","offer_id":48168085553373,"sku":"R.295512","price":144.69,"currency_code":"USD","in_stock":true},{"title":"53.96mm – Standard (R.295513)","offer_id":48168085586141,"sku":"R.295513","price":144.69,"currency_code":"USD","in_stock":true},{"title":"53.97mm – Oversize (R.295514)","offer_id":48168085618909,"sku":"R.295514","price":144.69,"currency_code":"USD","in_stock":true},{"title":"53.98mm – Oversize (R.295515)","offer_id":48168085651677,"sku":"R.295515","price":144.69,"currency_code":"USD","in_stock":true}],"url":"https:\/\/cmckarting.com\/products\/rotax-max-piston-assembly","provider":"CMC Karting","version":"1.0","type":"link"}