Centrifugal Clutch 5/8″ Bore 11T Fits ScooterX Sport Kart, Mini Bike, Mini Chopper, and Mini Motorcycles 2.8HP 97cc Engines. Go Cart Clutch Fit 2 – 6.5 HP 168 188 Gasoline Engines for Mini Bike,Generator, Garden Tractors,Go Karts, Single Wheel Drive Karts with Tires No Larger Than 15″ Tall. Metric Property Class 8.8 Bolt and Washer Kit are Included. Mounts Onto Crankshaft Using Bolt and Washer on the End of the Crankshaft. OEM Replacement Quality: Made of Quality Iron Material, Which is Lightweight, Portable, Sturdy, Durable, Maximum Torque, Wear-resisting and Fast Heat Disation. Bi-directional Operation, Clutch Can Mount Inward or Outward on Crankshaft, Easy to Install.