{"product_id":"motovecor-centrifugal-clutch-3-4-bore-10t-sprocket-for-40-41-420-chain-smooth-progressive-engagement-up-to-7hp","title":"Motovecor Centrifugal Clutch 3\/4\" Bore — 10T Sprocket for #40\/#41\/#420 Chain, Smooth Progressive Engagement Up to 7HP","description":"\u003cp\u003e\u003cstrong\u003eMotovecor's centrifugal clutch is a 3\/4\" bore, 10-tooth replacement designed to drive #40\/#41\/#420 chains on small engines up to about 7 HP.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis precision-machined clutch fits many popular mini bike and go-kart applications, giving a smooth engagement from typical cloned and commercial small engines. Built for use with common 3.5–6.5 HP engines (and rated up to 7 HP limit), the unit bolts to the crankshaft and engages the chain sprocket to transfer power to the drive system. It’s a straightforward upgrade or replacement for vehicles like Baja mini bikes and entry-level go-karts that use a 3\/4\" shaft and a 10-tooth sprocket.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this clutch improve starting and riding on a minibike or go-kart?\u003c\/h3\u003e\n\u003cp\u003eThe centrifugal design automatically engages as engine RPMs rise, eliminating the need for a manual clutch and simplifying operation. Engagement is progressive, which reduces sudden jerks and helps protect the drivetrain when accelerating from idle or low speeds.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAutomatic engagement above idle RPM for hands-free operation.\u003c\/li\u003e\n  \u003cli\u003eSmoother takeoff compared with a rigid connection.\u003c\/li\u003e\n  \u003cli\u003e10-tooth sprocket matched to #40\/#41\/#420 chains for common drivetrains.\u003c\/li\u003e\n  \u003cli\u003eSuitable for engines that reach typical operating RPMs around 2200–3600.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this fit my engine: which shafts and engines are compatible?\u003c\/h3\u003e\n\u003cp\u003eThis Motovecor clutch is made for a 3\/4\" (0.75\") shaft and mounts via the crankshaft end bolt and washer—check your crankshaft diameter before ordering. It's widely compatible with many cloned and OEM small engines used on off-road toys and DIY builds.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned for 3\/4\" shafts found on many GC\/GX\/clone engines.\u003c\/li\u003e\n  \u003cli\u003eWorks with GC160, GC190, GX120\/140\/160\/200 style engines and similar clones.\u003c\/li\u003e\n  \u003cli\u003eCompatible with Tecumseh-style 3\/4\" shafts on engines up to ~200 cc.\u003c\/li\u003e\n  \u003cli\u003eNot supplied with set screws or chain; verify existing fasteners and sprocket alignment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance limits and installation notes should I know?\u003c\/h3\u003e\n\u003cp\u003eThe clutch is commonly used on 3.5–6.5 HP engines and can handle up to roughly 7 HP in typical applications; exceeding these limits may shorten component life. Installation is simple but requires correct crankshaft fastening and proper chain tension to avoid premature wear.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRated for common small engines up to around 7 HP peak.\u003c\/li\u003e\n  \u003cli\u003eMounts with the crankshaft bolt and washer; uses the engine’s existing bolt pattern.\u003c\/li\u003e\n  \u003cli\u003eChain and set screws are not included—reuse or purchase separately.\u003c\/li\u003e\n  \u003cli\u003eEnsure proper alignment and tension to prevent sprocket or chain damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Riders, builders, and repairers upgrading or replacing a worn clutch on minibikes, go-karts, and light off-road machines will appreciate the Motovecor clutch. It’s aimed at hobbyists and small-vehicle owners using 3\/4\" shaft engines (GC\/GX clones, Tecumseh-style, and similar) who want a reliable centrifugal engagement, a standard 10-tooth sprocket for common chain sizes, and a straightforward bolt-on swap. If your vehicle uses a 3\/4\" crankshaft and #40\/#41\/#420 chain sizes with power in the 2–7 HP range, this clutch is a direct-fit candidate; confirm your shaft diameter, chain type, and that you have or will supply required set screws and chain before installing.\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: Does this clutch fit a 3\/4\" shaft?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the Motovecor clutch is designed for a 3\/4\" (0.75\") crankshaft bore and mounts with the engine’s crank bolt and washer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is chain or hardware included?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — chain and set screws are not included; you must supply the correct #40\/#41\/#420 chain and fastening hardware.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Motovecor","offers":[{"title":"Default Title","offer_id":48086304751774,"sku":"B07TKB52TW","price":41.88,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/motovecor-front-profile-clutch.jpg?v=1785894560","url":"https:\/\/northtrailauto.ca\/products\/motovecor-centrifugal-clutch-3-4-bore-10t-sprocket-for-40-41-420-chain-smooth-progressive-engagement-up-to-7hp","provider":"North Trail Auto","version":"1.0","type":"link"}