MOJTBE Centrifugal Go-Kart Clutch 1" Bore 14T — 6.5–13HP, #40/#41/420 Chain Compatible

This high-quality centrifugal clutch is built for riders and hobbyists who need a reliable connection between a small gasoline engine and a chain-driven drive system. Finished in durable iron and designed for efficient heat dissipation, the MOJTBE clutch supports #40, #41 and 420 roller chains and is most commonly used on go-karts, mini bikes, lawn mowers and fun karts. It offers straightforward installation and consistent engagement without the need for lubrication on the friction surfaces.

How does this clutch perform on engines up to 13HP?

The MOJTBE clutch is calibrated to engage at approximately 2300 RPM, giving predictable power transfer as your engine revs rise. It is rated for engines larger than 6.5HP and tested up to a top limit of 13HP, so it handles small performance engines without premature wear when matched correctly.

• Engagement speed: ~2300 RPM for smooth takeoff.
• Power range: recommended for 6.5HP–13HP engines.
• Materials: high-quality iron for heat resistance and torque handling.
• Application: suited for go-karts, mini bikes, fun karts, and small garden machinery.

Will this clutch fit my setup and chain type?

This unit uses a 1" bore hub and a 14-tooth sprocket compatible with #40, #41 and 420 roller chain standards. Confirm your engine crankshaft is a straight 1" diameter (or adapt with a compatible bushing or keyway) and ensure your chain pitch matches one of the listed sizes for smooth operation.

• Bore: 1" standard—may require keyway alignment or adapter.
• Sprocket teeth: 14T for common final-drive ratios on small karts.
• Chain types supported: #40, #41, 420 roller chain compatibility.
• Chain not included—choose correct pitch and width before installation.

What maintenance and installation tips should I follow?

The clutch is designed for dry friction surfaces—do not oil the contact faces, as lubrication can cause slippage, overheating and smoke. Because it is iron-built for fast heat dissipation, routine inspection of wear on shoes and springs will extend service life and maintain safe engagement characteristics.

• Do not apply oil to clutch shoes or contact surfaces.
• Inspect shoes and springs periodically for wear and replace as needed.
• Use correct torque on mounting fasteners and secure keyway alignment.
• Allow cooling periods under heavy use to prevent overheating.

How durable and safe is the MOJTBE centrifugal clutch?

Constructed from sturdy iron, this clutch combines lightweight handling with robust torque capacity and wear resistance. Its design supports efficient heat dissipation, reducing the risk of heat-related failures when installed and used within the recommended power range and serviced responsibly.

• Material: iron construction for strength and heat resistance.
• Design: balanced for reduced vibration and consistent engagement.
• Limit: suitable for engines up to 13HP—avoid exceeding the rating.
• Applications: ideal for karting and small machinery needing chain drive.

Who is this for? The MOJTBE centrifugal clutch is aimed at DIY mechanics, kart racers, minibike builders and small-equipment owners who want an affordable, heavy-duty clutch that pairs with common chain standards. If you run a gas engine between 6.5HP and 13HP and need a predictable, dry-friction engagement at about 2300 RPM, this clutch provides a practical, serviceable solution for hobby and light-utility drivetrains.