{"product_id":"sutmorly-centrifugal-clutch-assembly-for-go-karts-mini-bikes-1-bore-14-tooth-40-41-420-sprocket-heavy-duty","title":"Sutmorly centrifugal clutch assembly for go-karts \u0026 mini-bikes — 1\" bore, 14-tooth #40\/#41\/420 sprocket, heavy-duty","description":"\u003cstrong\u003eSutmorly's heavy-duty centrifugal clutch is a 1\" bore, 14-tooth clutch assembly with a #40\/41\/420 sprocket designed to transfer power from small gas engines to go-kart and mini-bike chains.\u003c\/strong\u003e\n\n\u003cp\u003eThis clutch assembly combines a robust 1\" bore for engines above 6.5 HP with a 14-tooth drive sprocket sized for common #40\/#41\/420 roller chain. Built for hobbyists and small-vehicle builders, the unit bolts onto standard engine shafts to give controlled engagement via centrifugal shoes, delivering smooth takeoff without a manual clutch lever. The product is popular in Prokart, Cadet, Fun Kart and buggy applications and includes a three-month warranty for added purchase confidence.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this clutch fit on my engine and drivetrain?\u003c\/h3\u003e\n\u003cp\u003eThe Sutmorly clutch uses a 1\" bore to mount securely on engine output shafts commonly found on engines larger than 6.5 HP (and up to about 13 HP). Its 14-tooth sprocket matches #40\/#41\/420 roller chains, so it replaces or upgrades directly without re-sprocketing in many setups. Installation requires correct keying and torque to the engine shaft and alignment to the driven sprocket to avoid premature wear.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1\" bore accepts standard keyed shafts for small gas engines\u003c\/li\u003e\n  \u003cli\u003e14-tooth sprocket tuned for #40\/#41\/420 roller chain\u003c\/li\u003e\n  \u003cli\u003eFits engines generally between 6.5 HP and 13 HP with proper mounting\u003c\/li\u003e\n  \u003cli\u003eRequires alignment, proper chain tension, and correct hardware torque\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance can I expect during normal use?\u003c\/h3\u003e\n\u003cp\u003eEngagement is centrifugal: the clutch shoes expand as rpm rises, connecting the engine to the chain smoothly. This provides predictable takeoff for go-karts and mini-bikes, reducing stalling and harsh starts compared with direct-drive setups. Durability depends on correct application and staying within recommended vehicle weight limits to avoid overheating.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSmooth automatic engagement at rising engine RPMs\u003c\/li\u003e\n  \u003cli\u003eReduces stalling and eases low-speed control for novice drivers\u003c\/li\u003e\n  \u003cli\u003eReliable for recreational and competitive fun-kart use with proper maintenance\u003c\/li\u003e\n  \u003cli\u003eExcessive load or weight will shorten service life—observe weight limits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there limits or maintenance steps I need to know?\u003c\/h3\u003e\n\u003cp\u003eYes. The clutch is engineered to move a limited mass; exceeding that limit causes overheating, accelerated wear, and possible failure. Keep the combined kart and rider weight under about 400 pounds and follow routine checks for sprocket teeth, chain wear, and shoe condition. Regular chain lubrication, correct tension, and ensuring the clutch spins freely at idle are basic maintenance steps.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRecommended maximum combined weight ~400 pounds for typical long life\u003c\/li\u003e\n  \u003cli\u003eInspect shoe material, sprocket teeth, chain tension, and alignment regularly\u003c\/li\u003e\n  \u003cli\u003eLubricate chain and replace worn parts before heavy use\u003c\/li\u003e\n  \u003cli\u003eThree-month warranty covers manufacturing defects as pictured\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and projects pair best with this clutch?\u003c\/h3\u003e\n\u003cp\u003eThis clutch is a straightforward upgrade for home-built and replacement applications on go-karts, mini-bikes, buggies, and similar small recreational vehicles. It’s favored in markets such as Prokart and Cadet where reliable centrifugal engagement and compatibility with #40\/41\/420 chain are desired. Use it where engine output, vehicle weight, and sprocket pitch match the product specifications.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWell-suited for go-karts, mini-bikes, buggies, and Prokart\/Cadet projects\u003c\/li\u003e\n  \u003cli\u003eReplace or upgrade existing 14T clutch\/sprocket combinations\u003c\/li\u003e\n  \u003cli\u003eBest with engines rated above 6.5 HP up to ~13 HP\u003c\/li\u003e\n  \u003cli\u003eDesigned for #40\/#41\/420 roller chain drivetrains\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: Builders, hobby mechanics, and small-vehicle racers who need a reliable centrifugal clutch that mounts on a 1\" shaft and uses 14-tooth #40\/41\/420 chain are the ideal customers. If you’re assembling or refurbishing a go-kart, mini-bike, or similar project and require smoother automatic engagement without adding complex linkage, the Sutmorly assembly offers a compact, compatible solution—provided the vehicle’s weight and engine power fall within the recommended range.\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: What chain sizes fit this Sutmorly clutch?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The 14-tooth sprocket is made for #40, #41, and 420 roller chain sizes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is the maximum engine power this clutch supports?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Designed for engines above 6.5 HP, it typically works up to about 13 HP.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Sutmorly","offers":[{"title":"Default Title","offer_id":48082937315486,"sku":"B075WQ28Y3","price":60.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/sutmorly-front-view-clutch-and-sprocket.jpg?v=1785819492","url":"https:\/\/northtrailauto.ca\/products\/sutmorly-centrifugal-clutch-assembly-for-go-karts-mini-bikes-1-bore-14-tooth-40-41-420-sprocket-heavy-duty","provider":"North Trail Auto","version":"1.0","type":"link"}