Size1: Size:3/4" Bore 10T 1.Centrifugal Clutch 3/4" bore, 10 Tooth for 40,41,420 chain, Up to7HP engines. Common clutch for 3.5-7hp engines 3600 to 4200 RPM 2.Perfect for Go Kart Minibike Baja Mini Bike MB165 and MB200, including Baja Heat, Mini Baja and the Baja Warrior 3.Compatible with 2-6.5hp Honda and Honda Cloned Engines GC160, GC190, GX120, GX140, GX160, GX200 Briggs and Stratton and 2-6.5 HP with 3/4” Shaft Tecumseh Engines 4.Mounts onto crankshaft using bolt and washer on the end of the crankshaft 5.Set screws and chain NOT included Compatibility: Baja Mini Bike MB165 & MB200 (Baja Heat, Mini Baja, Baja Warrior) Package includes 1 x Go Kart Clutch