Very popular in the for , and Fun Kart / Market Centrifugal Clutch 1 inch Bore 10Teeth Perfect for Go Kart Mini Bike. (Chain Size: 420) This clutch is used primarily on Mini Bikes and Go Karts,Just the thing for a big go-kart or mini bike! Our centrifugal clutch assembly with 1 inch shaft and 10 tooth 420 chain sprocket just may be the perfect missing item for your serious garage project go-kart. The 1 inch bore allows this clutch to work engines larger than 6.5 . In addition, the 10 tooth drive sprocket is made for use with the common 420 chain size. Centrifugal Clutch 1 inch Bore 10 Tooth Perfect for 420 Roller Chain Works engines larger than 6.5 (top limit - 13HP) Type: 20MM Colour: Black Material: iron Package contents: 1 x clutch NOTE Before Buying: The clutch is designed to be to move a certain amount of weight. Once the weight limit is exceeded, then the life of the clutch will be shortened Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.