Bore Size: 3/4 inch Horse Power: Up to 6.5 HP # of Teeth: 12T Chain Size : #35 Engagement Speed: 2000??100 RPM; No Set Screw Holes. Two Set Screws are NOT included! Centrifugal Clutch 3/4″ Bore 12 Tooth Perfect for Go Kart, Minibike, Fun Kart. (Chain Size: #35) Set Screws and Chain NOT Included. 2 – 6.5 HP Engines Honda GC160, GC190, GX120, GX140, GX160, GX200 This clutch will Fit for following application: Briggs Stratton and 2 – 6.5 HP With 3/4″ Shaft Tecumseh Engines 2 – 6.5 HP With 3/4″ Shaft Any Other Engines With 3/4 Crank Shaft and 3/16″ Key Way. 1900-3800 RPM 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.