Shaft Bore: 1 inch, Accommodates: #40/41/420 Chain, Tooth: 14. Centrifugal clutch 1 inch bore 14 tooth design. Suitable for 40-41-420 roller chain- up to 13hp horsepower. Engaging speed up to be 2300 RPM. Commonly used on Go Kart and Mini Bike, Lawnmower and Fun Kart, also can be used for many other applications. High impact,wear resistant that is super durable. Easy to install. Specifications: Shaft Bore :1″ Accommodates: #40/41/420 Chain Tooth: 14 Features: Centrifugal clutch 1 inch bore 14 tooth design. Suitable for 40-41-420 roller chain- up to 13hp horsepower. Engaging speed up to be 2300 RPM. High impact,wear resistant that is super durable. Commonly used on go karts, mini bikes. Direct Replacement for your old/broken clutch. Application: For Mini Bikes , Go Karts and More. * Warranty: 1 Year * At Twilight Garage, 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