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Different Clutch Shells
Parts differences between chain driven and belt driven shovelheads


The difference between a chain driven shovelhead and a belt driven shovelhead is not just about sprockets versus pulleys and chains versus belts. The belts (originally 1-1/2") are wider than a chain (even the widest o-ring chains will be less than 1"), and hence HD made numerous changes to several parts to accomodate the belt drive. The main differences are related to the primary, starter axis and housing, and swingarm:
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