RZR TURBO & RS1 PRIMARY CLUTCH LIMITER by Aftermarket AssassinsPrimary clutch limit washer fits 2016 & Up RZR Turbo, Turbo S, & RS1 Models Thicker than the OEM limit washer which limits the clutch shift. While this will limit your top speed more than factory, we found this to drastically help belt life and clutch longevity. This is because the belt does not come as far out of the primary clutch, giving it more surface area to grab. Because we limit the primary, it also prevents over shifting of the secondary