Clutch compatibility: Centrifugal clutch 5/8″ bore 11 tooth design for 2 – 6.5 HP 168 188 Gasoline Engines up to 8hp. Specification: Bore Size: 5/8 inch, Outside Diameter:4.22 inch, Horse Power: Up to 8 HP??Compatible Chain Size:#35, 11 Tooth Chain Sprocket, Engagement Speed: 2200+300RPM, Rear Tires: <15". High quality and Heavy Duty clutch: Made of Quality Iron Material, Which is Lightweight, Portable, Sturdy, Durable, Maximum Torque, Wear-resisting and Fast Heat Disation. Commonly use: minibike, generator, garden tractors, go karts, and for scooter x sport kart, mini bike, mini chopper, and mini motorcycles 2.8HP 97cc engines. Check and Confirm: Please check and confirm compatibility before purchasing. Contact us if you have any questions. Product Description Description: 100% Brand new, Never been used. Bore Size: 5/8 inch Teeth: 11T Keyway: 3/16 inch Outside Diameter: 4.22 inch Compatible Chain Size: #35 Engagement Speed: 2200+300RPM Rear Tires: <15" Horse Power: Up to 8 HP N