This step shim will be required when installing the STM weights part# 16 72AXEZ1-3 into your stock Arctic Cat primary clutch. It has .030 belt shim and .150 spider shim.
This helix is designed to work directly in the stock 2017 Sidewinder secondary. Made from billet 6061 aluminum.
This helix is cut and designed to prevent coil binding that occurs in the stock...