10 Tooth Centrifugal Clutch. 1" Bore Clutch for 40, 41 and 420 Chain. For Go Karts with 3 to 8hp Engines and rear wheels 15" or shorter. Requires a Crankshaft with a 1/4" Keyway and Tapped End so you can screw a bolt into the end of the crankshaft to hold the clutch on.

  
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