{"product_id":"sprocket-and-freewheel-for-mx500-mx650-rsf350-sx500-119-241","title":"Razor Sprocket and Freewheel for MX500\/MX650\/RSF350\/SX500","description":"\u003ch2\u003eDrive System Restoration: Razor Sprocket \u0026amp; Freewheel\u003c\/h2\u003e\u003cp\u003eRestore the smooth power delivery of your electric dirt bike with the \u003cstrong\u003eUniversal Parts Sprocket and Freewheel Assembly\u003c\/strong\u003e. Engineered specifically for high-torque Razor motors, this complete unit replaces worn, slipping, or \"frozen\" rear drive assemblies. By combining a precision-machined sprocket with a heavy-duty internal freewheel, this assembly ensures your chain grabs instantly during acceleration and coasts freely when you let off the throttle.\u003c\/p\u003e\u003ch3\u003eTechnical Performance Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete 3-Piece Assembly:\u003c\/strong\u003e Includes the drive sprocket, high-engagement freewheel, and a protective outer guard to prevent chain derailment or debris interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Thread Precision:\u003c\/strong\u003e Features a standard M34 x 1.00 thread pitch for a seamless \"spin-on\" installation to your factory rear wheel hub.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Steel Construction:\u003c\/strong\u003e Designed to withstand the high-torque demands of 500W and 650W motors without premature tooth wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e#25H Chain Optimized:\u003c\/strong\u003e Specifically profiled for #25H \"Heavy Duty\" chains, ensuring maximum contact area and reduced mechanical noise.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eComprehensive Fitment Guide\u003c\/h3\u003e\u003cp\u003eThis assembly is a direct-fit replacement for the following \u003cstrong\u003eRazor\u003c\/strong\u003e electric vehicles:\u003c\/p\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003eModel Family\u003c\/th\u003e\n\u003cth style=\"text-align: left;\"\u003eVersion Compatibility\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRazor MX500 \/ MX650\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMX500 (V22+) \/ MX650 (V15+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRazor SX500 \/ McGrath\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVersions 1 and up\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRazor RSF350\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eElectric Sport Bike (Standard Fitment)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRazor MX350 \/ MX400\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCompatible with select mid-frame versions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eChain Size:\u003c\/strong\u003e #25H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Pitch:\u003c\/strong\u003e M34 x 1.00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 7 Inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-Ref Part #:\u003c\/strong\u003e W15165070142, W15128199013\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003cblockquote\u003e\n\u003cstrong\u003eMechanic's Note:\u003c\/strong\u003e If your motor is spinning but the rear wheel isn't moving, your internal freewheel has likely failed. \u003cstrong\u003eInstallation Hack:\u003c\/strong\u003e These are \"spin-on\" parts that tighten as you ride. \u003cstrong\u003ePro Tip:\u003c\/strong\u003e To remove the old one, you may need a \u003cstrong\u003e\u003ca href=\"https:\/\/www.scooterworks.com\"\u003eFreewheel Removal Tool\u003c\/a\u003e\u003c\/strong\u003e or a hammer and punch—don't forget to apply a small amount of anti-seize to the threads before installing the new unit to make future service easier!\u003c\/blockquote\u003e\u003cp style=\"font-size: 0.85em; color: #666;\"\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e 119-241 \u003cbr\u003e\u003cstrong\u003eVendor:\u003c\/strong\u003e Universal Parts\u003c\/p\u003e","brand":"Universal Parts","offers":[{"title":"Default Title","offer_id":49985950613784,"sku":"119-241","price":40.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0782\/1728\/1816\/files\/454459.jpg?v=1775238252","url":"https:\/\/www.scooterworks.com\/products\/sprocket-and-freewheel-for-mx500-mx650-rsf350-sx500-119-241","provider":"Scooterworks USA, LLC","version":"1.0","type":"link"}