QYMOTO 3/4" Centrifugal Clutch for Mini Bikes & Go-Karts — 10T Sprocket, 40/41/420 Chain, Fits 3/4" (19mm) Shaft

QYMOTO 3/4" centrifugal clutch with a 10-tooth sprocket delivers a direct, bolt-on replacement for many 2–7 HP small engines using 40/41/420 chain.

This QYMOTO clutch is a compact, centrifugal unit designed to transfer power from popular small engines (including Predator 212 clones) to a 40/41/420 chain-driven drivetrain. It fits a 3/4" (19mm) shaft and is commonly used on minibikes, go-karts and utility machines rated up to roughly 7 HP. The clutch provides automatic engagement as RPM rises, simplifying installation and operation compared with belt-driven systems.

Will this clutch fit my engine and shaft?

The QYMOTO clutch is built for a 3/4" (19mm) shaft — confirm your crankshaft diameter before ordering. It is compatible with many cloned and OEM small engines (GC160/GC190/GX120/GX140/GX160/GX200 and similar), and commonly pairs with Predator 212-style engines that use a 3/4" shaft.

• 3/4" (19mm) bore — not compatible with 16mm cranks like some Hisun engines.
• Designed for 2–7 HP engines; typical safe operating RPM ~2300.
• Check engine model/specs or measure crankshaft to confirm fit.

How does it affect performance and drivability?

This centrifugal clutch engages automatically as engine RPM increases, allowing smooth takeoff without a manual clutch lever. It is suitable for recreational and light-duty applications where on-demand engagement and simple drivetrain layout are priorities.

• 10-tooth sprocket matched for 40/41/420 chain sizes.
• Automatic engagement gives predictable start-up motion and reduced stalling.
• Rated for small engines up to about 7 HP for reliable load handling.

What should I know about installation and maintenance?

Installation is straightforward: slide the clutch onto the 3/4" shaft, secure per your engine’s specification, and tension the chain to the recommended slack. Before first use, add a small amount of oil into the clutch as directed to ensure proper lubrication and reduce initial wear.

• One-piece centrifugal clutch (3/4" bore) — includes 10T sprocket for 40/41/420 chain.
• Add oil to the clutch before first operation to lubricate internal components.
• Verify keyway alignment and torque fasteners to engine manufacturer specs.

Which machines commonly use this clutch?

This clutch appears on many minibikes and go-karts and is often used as a replacement part for specific models. It is a common swap for machines that originally used similar centrifugal clutches with a 3/4" shaft and 10T sprocket geometry.

• Minibikes: Baja MB165, MB200 and other small-frame models.
• Go-karts and off-road utility machines like Coleman BT200X variants (check shaft size first).
• Works with many small-engine conversions using Predator 212-style or clone engines.

Who is this for: This QYMOTO centrifugal clutch is aimed at DIY mechanics, minibike and go-kart owners, and small-engine hobbyists who need a reliable, automatic-engaging sprocket clutch for 40/41/420 chain drivetrains. It’s well suited for replacements or upgrades when your machine uses a 3/4" shaft and requires a 10-tooth sprocket; however, it is not appropriate for machines with a 16mm crankshaft or applications beyond the recommended horsepower range. Always confirm shaft diameter and engine compatibility before purchasing.