ILONPA Centrifugal Go-Kart Clutch 3/4 inch Bore 12T — #35 Chain Compatible, Hardened Steel

ILONPA centrifugal clutch, 3/4" bore with 12 teeth, is a durable replacement clutch designed to fit small engines and drive #35 chains for go karts, minibikes and fun karts.

This clutch is a direct-fit aftermarket component built for engines with a 3/4" (0.75") crank shaft and a 3/16" keyway. Constructed from hardened steel, it’s intended to engage smoothly as engine RPM rises and transmit torque to a #35 chain sprocket. The package includes the clutch assembly and basic mounting hardware plus step-by-step break-in guidance to extend service life.

Will this clutch fit my engine model?

Check that your engine has a 3/4" (19.05 mm) bore and a 3/16" keyway; many 4–7 HP clone engines and common small engines match these specs. It is compatible with several Honda GX/GC series engines and many popular clone engines, but not with versions that use a 0.787" (20 mm) bore.

• Fits 3/4" crank shafts and 3/16" keyways
• Works with many 2–6.5 HP small engines and 5.5–6.5 HP clones
• Compatible with Honda GC160/GC190/GX120/GX140/GX160/GX200 models
• Not compatible with 0.787" (20 mm) bore variants

How durable and reliable is the ILONPA centrifugal clutch?

The clutch is made from high-quality steel designed to endure frictional heat and the mechanical stresses of routine use. Sturdy construction and a properly executed break-in procedure help minimize premature wear and improve longevity.

• Hardened steel construction for durability
• Balanced shoe design for smooth engagement
• Includes hardware to ensure secure mounting
• Manufacturer break-in instructions reduce glazing and extend life

What comes in the box and how do I install it?

The clutch kit ships with the centrifugal clutch, a clutch bolt with washer kit, a wrench and two screws so you have the essential parts to install. Follow the recommended lubrication and no-load break-in routine to seat the clutch shoes correctly and avoid overheating during initial use.

• Package includes clutch, bolt, washer kit, wrench and two screws
• Add lubricant around the circlip and rotate before mounting
• No-load engagement cycles: 3–5 repetitions with cool-down intervals
• Final check: ensure sprocket alignment and secure fasteners

How does it perform with chain drive and sprocket selection?

This clutch has a 12-tooth configuration designed to interface with #35 chain setups commonly used on karts and minibikes. Matched sprocket sizing and correct chain tension are important for efficient power transfer and to avoid premature wear on the clutch or chain.

• 12T clutch face works with #35 chain (chain not included)
• Use appropriate sprocket size to maintain chain tension and torque delivery
• Check alignment between engine output and rear axle sprocket
• Inspect chain and sprockets regularly for wear

Who is this for: The ILONPA 3/4" Bore 12T centrifugal clutch is for DIY mechanics, kart and minibike builders, and anyone replacing a worn or undersized clutch on small engines with a 3/4" shaft and 3/16" keyway. It is well suited to hobbyists upgrading clone or OEM engines in recreational vehicles, provided you confirm the 0.75" bore size. If you need a different bore diameter or a clutch keyed to a 20 mm shaft, choose the matching part number instead.