Genuine Comet Clutch, Made in the USA. 1" Bore, 10 Tooth Clutch for 40, 41 and 420 Chain - 1/2" Pitch. Comet SCS 400 Series Centrifugal Clutches are rated for 3 to 8 Horsepower Engines, 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. Comet Industries USA.

  
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