GYMMEDS Centrifugal Clutch 3/4" Bore 10-Tooth with #40/41/420 Chain — Fits 2–6.5HP Engines, Bolt-On for Go-Kart & Minibike

This compact clutch assembly pairs a durable 10-tooth drum with a matched #40/41/420 chain so you can convert popular 2–6.5HP engines into a centrifugal-driven final drive. Constructed from impact- and wear-resistant steel, the unit mounts to a 3/4" crankshaft using the included bolt, washer kit and wrench. It’s designed for single-wheel drive setups (tires up to 15" tall) and is commonly used with Predator 212 clones and Honda/Briggs-style small engines.

How does this clutch engage and transfer power?

As engine RPM rises, centrifugal weights move outward to contact the inner drum, creating friction that turns the clutch drum and connected sprocket. This automatic engagement eliminates the need for manual clutches or belts for basic go-kart and minibike projects, providing smooth takeoff and reliable torque transfer at working RPMs.

• 10-tooth sprocket matched to #40/#41/#420 chain for consistent drive.
• Centrifugal weight system that engages progressively with RPM.
• Engineered to handle typical 2–6.5HP output without external linkage.
• Fast heat dissipation from steel construction to resist wear.

Which engines and machines is this clutch compatible with?

This clutch fits any engine with a 3/4" crankshaft and a 3/16" keyway, including many Predator 212 clones, Honda GC/GX series (and clones), and common Briggs-style small engines. It’s ideal for single-wheel drive go-karts, mini choppers, garden tractors converted for small tasks, generators, and similar DIY projects.

• Direct fit for 212cc Predator-style engines and many 5.5–6.5HP clones.
• Compatible with Honda GC160/GC190/GX120/GX140/GX160/GX200 style engines.
• Works with Tecumseh and most engines using a 3/4" shaft plus 3/16" keyway.
• Intended for single-wheel drive systems with tires ≤15" tall.

What’s included and how easy is installation?

The package contains the 3/4" bore 10-tooth clutch, a matched chain, a clutch bolt, washer kit and a wrench so you can mount it straight out of the box. Installation is straightforward: slide onto the crankshaft, secure with the provided bolt and washer, and align the sprocket and chain to the driven sprocket. No special machining is required for most standard small engines.

• 1 × 3/4" bore 10-tooth clutch and 1 × #40/41/420 chain included.
• Hardware kit includes clutch bolt, washer set, and installation wrench.
• Bolt-on mounting to crankshaft end; simple alignment of chain and sprockets.
• Recommended to verify shaft diameter and keyway before fitting.

What materials and durability features does the clutch use?

Primary components are manufactured from high-grade, impact- and wear-resistant steel to withstand regular load cycles and heat from engagement. The design balances low weight with durability so the clutch responds quickly while offering long service life under normal hobbyist and light-commercial use.

• High-impact steel drum and sprocket for abrasion resistance.
• Optimized mass for quick centrifugal response and torque transfer.
• Surface finish and geometry for faster heat dispersion during use.
• Chain size chosen for durability and availability (#40/#41/#420).

Who this is for: builders, hobbyists and small equipment owners who need a reliable, quick-install centrifugal clutch to convert popular small engines into single-wheel drive powertrains. Ideal for go-kart and minibike projects, garden tractor conversions, portable generators and anyone working with Predator 212-style or similar 2–6.5HP engines that use a 3/4" shaft.