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Get a range of top quality Mini bike 5/8 in shaft for most makes and models of mini bikes with various tooth configurations and chain sizes, all at OMB Warehouse. These items are perfect as OEM replacement parts and sourced from top brands and manufacturers. The best selling item in our inventory is the Trkimal Go Kart/Mini Bike Clutch 5/8 Bore #35 Chain 11 Tooth. The shaft accepts 35# Chain (3/8" chain pitch) 11 Tooth Sprocket Racing Centrifugal Clutch. The Clutch fits 2 - 6.5 HP 168 188 Gasoline Engines for mini bikes and Single Wheel Drive Karts with Tires no larger than 15" Tall. Set Screws Not Included, Bi-directional operation, Easy to install. Another in-demand product is the Centrifugal Clutch 5/8" Shaft and 10 Tooth Fit for #40/41/420 Chain Sprocket for Mini Bike. Specifications are Tooth:10T; Works with #40/41/420 Chain (Chain Not included), 5/8" bore Designed for 6.5hp 212CC Engines, Package includes:1 x Go Kart Centrifugal Clutch. Made of high quality iron material, which is lightweight, portable, sturdy, durable, maximum torque, wear-resisting, and fast heat dissipation. Mini bike clutches are not very complex systems. Most mini bikes use these very simple but durable centrifugal clutch units to transfer power from the engine to the belt or drive chain.