Go Kart Centrifugal Clutch 3/4 Bore 12T Tooth # 35 Chain Sprocket Mini Bike Teeth: 12T Bore Size: 3/4 inch Compatible Chain Size: #35 Engagement Speed: 2000??100 RPM Horse Power: Up to 6.5 HP Keyway: 3/16 inch Outside Diameter: 4.22 inch This Clutch Will Fit 2 – 6.5 HP Engines Honda GC160, GC190, GX120, GX140, GX160, GX200 Also will fit Briggs Stratton and 2 – 6.5 HP With 3/4″ Shaft Also Will Fit Tecumseh Engines 2 – 6.5 HP With 3/4″ Shaft And Any Other Engines With 3/4 Crank Shaft and 3/16″ Key Way. Chain: 35# 116 Links Rear Sprocket: 58T 29mm , 65T 37mm depend on what your choose Motor Sprocket: 9T 11t depend on what your choose Package includes : Depend on what you choose