MOJTBE Centrifugal Go-Kart Clutch 1" Bore 14-Tooth Sprocket for #40/#41/#420 Chains, 6.5–13HP Iron Construction

This heavy-duty replacement clutch is built for go-karts, mini-bikes, lawnmowers and fun karts that need reliable torque transfer without manual shifting. Constructed from durable iron for effective heat dissipation and long wear life, it engages around 2300 RPM and accepts a 1" keyed shaft. The sprocket supports standard #40, #41 and #420 roller chains (chain not included), making it a versatile choice for aftermarket upgrades or maintenance swaps.

How does this clutch activate and protect my engine?

The centrifugal design uses weighted shoes that expand as engine RPM rises, engaging the sprocket automatically when the set engagement speed is reached. This allows the engine to idle without turning the drive system, reducing stress during starts and stops. It also helps prevent stalling under light loads and provides progressive torque transfer for smoother acceleration.

• Automatic engagement at approximately 2300 RPM for predictable behavior.
• Weighted shoes for gradual contact and reduced shock loading.
• Iron construction for heat dispersion and long service life.

Will this clutch fit my engine and chain setup?

Compatibility centers on three main specs: bore size, sprocket teeth and chain type. The MOJTBE clutch features a 1" (25.4 mm) bore with a keyed shaft interface and a 14-tooth sprocket sized for #40/#41/#420 roller chains. It is recommended for engines above 6.5HP up to a 13HP maximum—verify shaft key size and overall dimensions before ordering.

• 1" bore with keyway — confirm your shaft diameter and key size.
• 14-tooth sprocket cut for #40, #41, #420 roller chains (chain sold separately).
• Rated for gas engines from 6.5HP (212cc) up to 13HP peak engines.

How durable is the clutch and what maintenance does it need?

Made from quality iron, this clutch resists wear and disperses heat faster than many lightweight alternatives. It is designed to be used without lubrication on the friction surfaces—applying oil can raise operating temperature and cause smoking. Routine inspection for wear, proper sprocket alignment and chain tension will extend service life.

• Iron body for toughness and effective heat dissipation.
• Do not oil the friction surfaces—avoids overheating and smoking.
• Inspect shoes, springs and sprocket teeth periodically for wear.

What applications and installation tips should I know?

This clutch is intended for recreational and light-duty work vehicles such as go-karts, mini-bikes, small lawnmowers and fun karts. Installation requires basic mechanical skills: sliding the clutch onto the keyed shaft, securing with the correct fasteners, aligning the sprocket and setting proper chain tension. If unsure, consult a mechanic to ensure safe fitment and alignment.

• Common uses: go-karts, mini-bikes, lawnmowers, fun karts.
• Requires proper keyed shaft installation and torque on mounting fasteners.
• Align sprocket and set chain tension to manufacturer recommendations.

Who is this for: The MOJTBE Centrifugal Go Kart Clutch is ideal for hobbyists and small-vehicle technicians who need a sturdy, automatic-engage clutch for 6.5HP–13HP gas engines. Choose this unit if you want a durable iron-built clutch with a 1" bore and 14-tooth sprocket compatible with #40/#41/#420 roller chains, and be prepared to inspect and maintain it periodically for best performance.