Centrifugal Clutch 12 Teeth ?? Bore Size : 3/4″ (0.75inch / 19.05mm). Please confirm the size of the product and whether it fits your Minibike before purchasing. Fit for: 35 Chain 12T for Go Kart Mini Bike Engine,Motors No More Than 200 cc Only. 3/16″ Key Way. Fit 2 – 6.5 HP Small Engines Parts Honda GC160, GC190, GX120, GX140, GX160, GX200 Engagement Speed (RPM): 2,300 Perfect for Go Kart, Minibike, Fun Kart.Go Kart Minibike Belt Direct Drive Fun Kart Centrifugal Clutch 3 4 Bore 12 Tooth #35 Chain Fit Briggs & Stratton 2 – 6.5 HP with 3/4″ Shaft 212 212cc Predator Engine Clutch and Any Other Go Cart Motor Auto Engines with 3/4 Crank Shaft and 3/16″ Key Way Set screws and chain NOT included. Mounts onto crankshaft using bolt and washer on the end of the crankshaft.( Clutch does not need set screws as long as the end of the crankshaft is threaded to accept a bolt. Most go kart clutches are held onto the shaft with a bolt and larger washer. Extra washers if needed are used