{"product_id":"ciloyu-mini-bike-sprocket-40t-40mm-bore-kit-with-420-chain-complete-replacement-for-ct100u-ct200u","title":"CILOYU Mini Bike Sprocket 40T 40mm Bore Kit with 420 Chain — Complete Replacement for CT100U\/CT200U","description":"\u003cp\u003e\u003cstrong\u003eCILOYU Mini Bike Sprocket 40T is a heavy-duty 40-tooth 420-chain sprocket kit built to replace or upgrade drivetrains on CT100U\/CT200U-style mini bikes and similar 200–212cc machines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis complete sprocket and chain kit supplies a larger-diameter 40-tooth driven sprocket plus a matching 420 chain, sprocket key, master links, mounting hardware and a chain breaker — everything needed to install on a range of small off-road bikes and go-karts. The design adds mounting hole options and a bigger center bore to fit engines and hubs commonly found on Coleman, Baja, Hensim, Massimo and other mini bike platforms, improving torque delivery and reducing wear compared with smaller 420 sprockets.\u003c\/p\u003e\n\n\u003ch3\u003eHow will this 40T sprocket change my bike’s performance?\u003c\/h3\u003e\n\u003cp\u003eMoving to a 40-tooth driven sprocket typically increases low-end acceleration and climbing power by giving the engine more mechanical advantage at the rear wheel. Riders who want stronger pull from a stop or when climbing trails will notice improved torque, although top speed may be reduced if gear ratios are made shorter.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigher torque and stronger initial acceleration\u003c\/li\u003e\n  \u003cli\u003eSmoother power transfer with precision-machined teeth\u003c\/li\u003e\n  \u003cli\u003eBetter chain life due to improved tooth engagement\u003c\/li\u003e\n  \u003cli\u003eIdeal for off-road and uneven terrain where low-speed control matters\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich mini bikes and engines is this kit compatible with?\u003c\/h3\u003e\n\u003cp\u003eThe kit is intentionally universal across many small-engine mini bikes and go-karts that use 420 chain sizes and common mounting patterns. It suits a broad list of models from manufacturers like Coleman, Baja, Hensim, Massimo, TrailMaster and others, but compatibility depends on the bolt-circle and center-bore dimensions of your hub or engine sprocket area.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits many 196–212cc and similar small engines with 420 chain drives\u003c\/li\u003e\n  \u003cli\u003eWorks on Coleman CT100U, CT200U and similar models with adapter changes\u003c\/li\u003e\n  \u003cli\u003eFour- and six-hole mounting patterns match multiple hub types\u003c\/li\u003e\n  \u003cli\u003eCenter bore 40 mm to accommodate larger engine output shafts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat hardware and extra parts are included for installation?\u003c\/h3\u003e\n\u003cp\u003eThis kit is packaged to be installation-ready: you get the 40T driven sprocket plus a smaller 10T counter sprocket, two lengths of 420 chain, a chain breaker, master links, mounting screws and nuts, and a 3\/16\" keyway. The included items let you adapt the kit to different setups without hunting for add-ons.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e40T 420 driven sprocket and 10T counter sprocket\u003c\/li\u003e\n  \u003cli\u003e90-link and 42-link 420 chains with five master links\u003c\/li\u003e\n  \u003cli\u003eTen screws, ten nuts, 3\/16\" key and a chain breaker tool\u003c\/li\u003e\n  \u003cli\u003eMounting hole patterns: 49 mm and 80 mm bolt circles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I know the sprocket will physically fit my setup?\u003c\/h3\u003e\n\u003cp\u003eMeasure your current sprocket’s bolt-circle diameter and center bore before ordering. This CILOYU sprocket offers two bolt-circle sizes (49 mm and 80 mm) plus a 40 mm center hole so it matches many hubs; the six-hole option fits larger-engine conversions while the outer four holes suit standard mini-bike hubs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCenter bore: 40 mm (1.57\")\u003c\/li\u003e\n  \u003cli\u003eSix-hole bolt circle: 49 mm center-to-center\u003c\/li\u003e\n  \u003cli\u003eFour-hole bolt circle: 80 mm center-to-center\u003c\/li\u003e\n  \u003cli\u003eUse included screws and nuts sized for typical mini-bike hubs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: riders and tinkerers upgrading mini-bike drivetrains, small-engine mechanics, and DIY go-kart builders who need a robust 420-chain 40-tooth sprocket kit with multiple mounting options. If you run a Coleman, Baja, Hensim, Massimo, TrailMaster or similar mini bike and want stronger low-end pull, longer chain life, and a kit that includes installation hardware, this CILOYU set is designed for that use. Always verify bolt-circle and center-bore measurements for a correct fit before installation.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this sprocket fit my Coleman CT200U?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Possibly—measure your bolt-circle and center bore. This kit offers 49 mm and 80 mm bolt circles and a 40 mm center hole to match many CT200U configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is a chain breaker included?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the kit includes a chain breaker, master links and both 90-link and 42-link 420 chains for installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"CILOYU","offers":[{"title":"Default Title","offer_id":48083836666014,"sku":"B0FD37K6B5","price":63.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ciloyu-front-sprocket-and-packaging.jpg?v=1785836963","url":"https:\/\/northtrailauto.ca\/products\/ciloyu-mini-bike-sprocket-40t-40mm-bore-kit-with-420-chain-complete-replacement-for-ct100u-ct200u","provider":"North Trail Auto","version":"1.0","type":"link"}