This dual adjuster for 4-speed transmissions fits 1936-64 (tin primary) and 4-speed transmissions thru 1984 with open primary drives and is recommended for use with the Cannonball Transmission Base Plate 1936-1985 for 4 Speed Harley-Davidson Big Twins. Recommended when using a Cannonball SSK-S electric start system or a high performance engine.
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