Motovecor Centrifugal Clutch for Go-Kart & Minibike — 3/4" Bore 12T #35 Chain, Fits 2–6.5HP Engines, Auto-Engage

Motovecor centrifugal clutch: a direct-fit 3/4" bore, 12-tooth clutch designed for #35 chain to upgrade small engines on go-karts, minibikes and mini project builds.

If you need a durable replacement or an upgrade clutch for popular 2–6.5 HP engines, this Motovecor unit offers a compact centrifugal design that engages automatically as RPM rises and accepts standard #35 chain sprockets. It’s engineered to work on common horizontal shaft engines with a 3/4" crank and 3/16" keyway, giving you a simple bolt-on option for fun karts, mini bikes, and small utility projects.

Which engines and machines will this clutch fit?

This clutch fits most small horizontal-shaft engines that have a 3/4" crank with a 3/16" keyway and fall in the 2–6.5 HP range. It commonly pairs with popular models and clone motors, so it’s versatile for many hobby and repair needs.

• Compatible with Honda GX120, GX140, GX160, GX200 and similar clones
• Works with Predator 212cc, Harbor Freight clones, and many 5.5–6.5 HP engines
• Designed for go-karts, minibikes, mini choppers, and light-duty power equipment

How does the clutch behave during acceleration and normal use?

The Motovecor centrifugal clutch is spring-weighted so it stays disengaged at idle and engages progressively as RPM increases, transferring power to the chain only when needed. That means smoother starts and automatic engagement without manual clutch control.

• Automatic engagement around recommended operating RPM for small engines
• Smooth power transfer reduces stalling on takeoff and idling issues
• Durable shoe and drum design for repeated start/stop cycles

What installation hardware and accessories are included?

The clutch ships with two set screws for securing it to the engine shaft; the drive sprocket and chain are not supplied, so you can choose sprocket tooth counts to match your gearing needs. Installation is straightforward for anyone comfortable with basic hand tools and engine mounting procedures.

• Includes two set screws for secure mounting to the shaft
• No sprocket or chain included — choose a #35 sprocket for this 12-tooth hub
• Requires a 3/16" key in the shaft for proper torque transfer

What performance and sizing details should I check before buying?

Confirm your engine’s shaft diameter, keyway size and desired gearing before ordering to avoid fitment issues. This clutch is a 12-tooth unit sized for #35 chain and intended for small engine RPM ranges used in recreational karts and bikes.

• Bore: 3/4" (0.750") with 3/16" keyway requirement
• Tooth count: 12T; chain size: #35 (compatible sprockets required)
• Recommended for 2–6.5 HP engines operating at standard small-engine RPMs

Who is this for? This Motovecor clutch is aimed at hobbyists, racers and DIY mechanics who need a reliable centrifugal clutch for small engine builds, repairs or upgrades. If you’re building or restoring a go-kart, minibike or compact utility machine and your engine has a 3/4" shaft with a 3/16" keyway, this clutch gives a straightforward, bolt-on way to add or restore chain drive power. It’s not supplied with a drive chain or sprocket, so buyers should be prepared to select compatible #35 chain components to match their final gear ratio and application.