{"product_id":"carkio-centrifugal-clutch-for-go-kart-3-4-20mm-bore-10-tooth-for-40-41-420-chain-black","title":"Carkio Centrifugal Clutch for Go-Kart — 3\/4\" (20mm) Bore, 10-Tooth for #40\/41\/420 Chain, Black","description":"\u003cp\u003e\u003cstrong\u003eThe Carkio Go Kart Centrifugal Clutch is a durable 10-tooth, 3\/4\" (20mm) bore aftermarket clutch designed to drive #40\/41\/420 chain on small engines up to 8hp.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact centrifugal clutch gives hobbyists and small-vehicle builders a simple, bolt-on solution to transfer power from the crankshaft to a chain-driven rear axle or sprocket. Built from metal with a black finish and a 107mm outer diameter, it is engineered for typical 3.5–7hp engines and can tolerate up to about 8hp under common operating conditions. It includes a 3\/16\" key and matches standard #40\/41\/420 chain sizes used across go-kart and minibike setups.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this clutch engage and protect my engine?\u003c\/h3\u003e\n\u003cp\u003eThe centrifugal design automatically engages as engine RPM increases, so the vehicle remains stationary at idle and begins driving as revs rise. This reduces stalling and provides gradual power transfer for smoother starts. It also isolates the engine from sudden load changes compared with a direct drive connection.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEngages automatically with increasing RPM for smooth starts\u003c\/li\u003e\n  \u003cli\u003eBuilt-in 3\/16\" key ensures secure crankshaft coupling\u003c\/li\u003e\n  \u003cli\u003eMounts on the crank with a bolt and washer for straightforward installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this clutch fit my engine and chain setup?\u003c\/h3\u003e\n\u003cp\u003eMeasure the engine crank bore and confirm the chain size before ordering; this clutch has a 20mm (3\/4\") inner bore and is sized for #40, #41, and #420 chains. It is commonly used on 3.5–7hp engines—practical for many go-karts, minibikes, and small utility machines. If your crank requires set screws or a different bore, consider a model designed for those features.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInner bore: 20mm (3\/4\") — verify crankshaft diameter\u003c\/li\u003e\n  \u003cli\u003eChain compatibility: #40, #41, #420\u003c\/li\u003e\n  \u003cli\u003eCommonly suited to engines up to 8hp; check engine RPM and application\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install and maintain the Carkio centrifugal clutch?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward: slide the clutch onto the crankshaft, align the 3\/16\" key, and secure it with the crank bolt and washer. Basic maintenance includes periodic inspection of the shoe surfaces, chain alignment, and fastener torque. Keep the clutch free from excessive dirt and debris to preserve engagement performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSimple bolt-on mounting to the crankshaft with included keyway\u003c\/li\u003e\n  \u003cli\u003eInspect shoes, bearings, and keyway for wear every few hours of run time\u003c\/li\u003e\n  \u003cli\u003eMaintain proper chain tension and alignment to prevent premature wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the physical specifications and what’s included?\u003c\/h3\u003e\n\u003cp\u003eThe clutch measures approximately 107mm outer diameter with a total height near 55mm and contains 10 teeth for the sprocket interface. It ships as a single aftermarket centrifugal clutch unit and is finished in black metal. Because it is an aftermarket component, confirm measurements and fit before installation to ensure compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaterial: metal with black finish; outer diameter: 107mm; height: ~55mm\u003c\/li\u003e\n  \u003cli\u003eTeeth: 10; bore: 20mm (3\/4\"); built-in 3\/16\" key\u003c\/li\u003e\n  \u003cli\u003ePackage: 1 x Carkio Go Kart Centrifugal Clutch (aftermarket compatible)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This Carkio centrifugal clutch is aimed at DIY go-kart and minibike builders, repair shops, and small-engine hobbyists who need a reliable, affordable aftermarket clutch for chain-driven setups. It’s best for users who can verify shaft and chain dimensions, want a simple bolt-on solution, and value a robust metal clutch that handles routine recreational and light utility use.\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: Is this clutch compatible with my 6.5hp engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes if your crankshaft bore is 20mm (3\/4\") and you use #40\/#41\/#420 chain. Verify shaft size and mounting method before purchase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the clutch include set screws for shaft locking?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No—this aftermarket Carkio clutch uses a keyway and crank bolt; choose a model with set screws if required.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Carkio","offers":[{"title":"Default Title","offer_id":55171230171479,"sku":"B092LPFB4H","price":62.58,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/carkio-clutch-front-view.jpg?v=1790441027","url":"https:\/\/britishgarage.co.uk\/products\/carkio-centrifugal-clutch-for-go-kart-3-4-20mm-bore-10-tooth-for-40-41-420-chain-black","provider":"British Garage","version":"1.0","type":"link"}