Very popular in the Honda Prokart, Cadet and Fun Kart / Buggy Market Centrifugal Clutch 1 inch Bore 14 Teeth Perfect for Go Kart Mini Bike. (Chain Size: #40/41/420) 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 14 tooth 40/41/420 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 with gas engines larger than 6.5 Hp. In addition, the 14 tooth drive sprocket is made for use with the common 40/41/420 chain size. Centrifugal Clutch 1 inch Bore 14 Tooth Perfect for 40-41-420 Roller Chain Works with gas engines larger than 6.5 HP (top limit - 13HP) Color: black Material: iron Package Contents: 1 x Motorcycle clutch NOTE Before Buying: The clutch is designed to be able to move a certain amount of weight. Once the weight limit is exceeded, then the life of the clutch will be shortened (it will get burning hot very soon or even broken). Please make sure the total weight of the kart and driver (and passenger when it is a two seat kart) will not exceed 400 pounds (Average weight limit for most clutches). 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.