Dynojet Clutch Kits were designed from the ground up. Each kit contains fully adjustable arms with precision magnetic weights, and balanced springs. When paired with a Power Vision performance tune, Dynojet's clutch kits allow for smooth engagement and delivers the power when you need it. All kits are developed on our in-house Dynojet Dyno and field tested to ensure maximum performance in all riding conditions. It's important to check the length of your primary bolt. Early units had a length of 165mm and was later superceded to a bolt that is 175mm. The Polaris part number for the updated bolt is 7519812. Do NOT reuse your bolt if it is the 165mm length.