Shaft Bore: 1″; Accommodates: #40/41/420 Chain; Tooth: 14. Suitable for 40-41-420 roller chain- up to 13hp horsepower. Engaging speed up to be 2300 RPM. This clutch is used primarily on Go Kart and Mini Bike, Lawnmower and Fun Kart. Package included: 1 x 1″ Bore 14T go kart centrifugal clutch, 1 x #40/41/420 chain, 2 x screws. Lightweight, sturdy & durable, high impact, wear-resisting, fast heat disation, stronger and features maximum torsion. Specifications: Shaft size: 1″Bore Accommodates: #40/41/420 Chain (Chain Not included) Tooth Count: 14 Tooth Engaging Speed: 2300 RPM Two set screws are included. Application for: Mini Bikes and Go Karts Other applications Package Included: 1 X Go kart centrifugal clutch 1 x #40/41/420 Chain 2X Screws 1 x Connecting Link 1 Year Warranty. At AutoHorizon, If you need any assistance, or just have questions, please do not hesitate to contact us. We are dedicated to providing you with all of the information you need to make a con