Centrifugal Clutch 3/4" Bore #40/41/420 Chain 10 Tooth Go Kart Mini Bike Drift Trike Know your gear ratio! A 10T #41 clutch would need a 50T or larger rear sprocket. Vehicles with rims larger than 6" or tires with a diameter of 15" or larger should upgrade to a belt drive TAV system. Gear ratios outside of these recommendations voids any warranty. Clutch: Shaft size: 3/4" Bore Chain Size: 40/41/420 Chain Tooth Count: 10 Tooth Engagement is Approximately: 1800-2200 RPMs Replace your worn our clutch with this affordable item. Can be mounted inboard or outboard. Has key stock. Does not come with set screws. Fits the following motors and many others: Fits Honda GX160 Fits Honda GX200 Harbor Freight Greyhound 196cc Harbor Freight Predator 212cc Nearly all 5.5 HP clones Nearly all 6.5 HP clones Nearly all 4-7HP motors, all brands. PLEASE MEASURE YOUR CRANKSHAFT TO BE SURE!