Centrifugal Automatic Clutch 3/4" Bore For 428 Chain 19mm 20mm 25.4mm 13T Tooth For Go Kart Karting Bike Engine parts This centrifugal automatic clutch features a 3/4 inch bore and is designed for use with 428 chains.It has a 13T tooth configuration that supports efficient power transmission and smooth engagement.The clutch is constructed from iron and comes in a black finish, offering durability suitable for go kart, karting, and bike engine applications. Available with bore sizes of 19mm, 20mm, and 25.4mm, it provides flexibility for different engine setups.The centrifugal design allows for automatic , enabling engagement as engine speed increases and disengagement at lower speeds.This mechanism supports performance in dynamic operating conditions. The clutch is built to endure -speed use and integrates easily into compatible drivetrain systems.Its design focuses on functional efficiency and straightforward installation, making it suitable for both recreational and performance-oriented builds. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.