Application Compatible for Mini Bikes and Go Karts, Lawnmowers,Scooter X Sport Kart Compatible for Mini Bike, compatible for Mini Chopper, Lawnmower, Garden Equipment Log Splitters, Pumps, Riding Mowers, Snow Throwers Garden Tractors, and compatible for Mini Motorcycles Specification Shaft Bore : 5/8\'\' Tooth: 11 Keyway: 3/16\'\' Compatible Chain Size: #35 Horse Power: 8 HP Max Engagement Speed: 2000±100 RPMPackage Include: 1x Centrifugal Clutch Notice No Instruction Included Please feel free to contact us for whateve we can help.