GYMMEDS centrifugal clutch for small engines — 3/4" bore 12‑tooth with #35 chain, bolt‑on automatic engagement

The GYMMEDS 12‑tooth centrifugal clutch (3/4" bore) with #35 chain is a bolt‑on drive clutch designed to deliver reliable power transfer for Predator 212, Honda GC/GX series and most 2–6.5HP small engines.

This precision-made clutch assembly lets hobbyists and small-engine technicians add automatic engagement to go karts, minibikes, mini choppers, lawn equipment and compact generators. Built from high‑impact wear-resistant steel, it mounts directly to a 3/4" crankshaft with a 3/16" keyway and includes the common hardware needed for installation so you can get running quickly.

Will this clutch fit my engine?

Compatibility depends on two crankshaft specs: a 3/4" diameter and a 3/16" keyway. It was designed for widely used small engines such as Predator 212 and many Honda GX/GC models, plus popular 5.5–6.5HP clone motors.

• Fits engines with a 3/4" crankshaft and 3/16" keyway
• Common fits: Predator 212, Honda GX160/GX200/GX140/GX120, GC160/GC190
• Also compatible with many Briggs, Tecumseh and clone 4–7HP motors

How durable and heat-resistant is the clutch under load?

The clutch housing and internal components use high-impact, wear-resistant steel engineered for repeated engagement and good heat dissipation. That construction reduces wear during frequent starts and stops while helping the clutch remain stable under typical kart and minibike loads.

• High-grade steel for wear resistance and lightweight durability
• Fast heat dissipation design to reduce thermal stress
• Engineered for regular recreational and light commercial duty

What’s included and how easy is installation?

The package contains the clutch assembly plus the mounting hardware and a #35 chain, so you won’t have to source common parts separately. Installation is straightforward: slide onto the crank, secure with the included bolt and washer, and fasten the clutch with the supplied screws for a double-secure fit.

• Includes 3/4" bore 12T clutch, #35 chain, bolt, washer kit and wrench
• Two screws supplied for added mounting security
• Simple bolt-on fit for compatible crankshafts; basic hand tools required

What performance should I expect on my go kart or mini bike?

This centrifugal clutch engages automatically as RPM rises, giving smooth takeoffs and hands-free engagement ideal for novice drivers and utility use. With a 12‑tooth sprocket and #35 chain the unit balances torque transfer and top-end speed appropriate for small‑engine recreational vehicles.

• Automatic engagement with engine RPM — no manual clutch lever needed
• 12-tooth sprocket offers a practical gear ratio for acceleration and speed
• #35 chain included for immediate drivetrain setup

Who is this for: The GYMMEDS 3/4" bore 12T centrifugal clutch is ideal for DIY builders, karting hobbyists, landscapers modifying small equipment, and repair shops working on Predator 212, Honda GC/GX engines and similar 2–6.5HP motors. If you need a rugged, easy-to-install automatic clutch with a standard sprocket and chain for go karts, minibikes, mini choppers or light-duty machinery, this assembly offers a practical, ready-to-fit solution. Always verify your crankshaft diameter and keyway size before ordering, and follow safe installation practices.