Motovecor Centrifugal Clutch 3/4" Bore — 10T Sprocket for #40/#41/#420 Chain, Smooth Progressive Engagement Up to 7HP

Motovecor'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.

This 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.

How does this clutch improve starting and riding on a minibike or go-kart?

The 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.

• Automatic engagement above idle RPM for hands-free operation.
• Smoother takeoff compared with a rigid connection.
• 10-tooth sprocket matched to #40/#41/#420 chains for common drivetrains.
• Suitable for engines that reach typical operating RPMs around 2200–3600.

Will this fit my engine: which shafts and engines are compatible?

This 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.

• Designed for 3/4" shafts found on many GC/GX/clone engines.
• Works with GC160, GC190, GX120/140/160/200 style engines and similar clones.
• Compatible with Tecumseh-style 3/4" shafts on engines up to ~200 cc.
• Not supplied with set screws or chain; verify existing fasteners and sprocket alignment.

What performance limits and installation notes should I know?

The 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.

• Rated for common small engines up to around 7 HP peak.
• Mounts with the crankshaft bolt and washer; uses the engine’s existing bolt pattern.
• Chain and set screws are not included—reuse or purchase separately.
• Ensure proper alignment and tension to prevent sprocket or chain damage.

Who 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.