Primary Clutch Spring for Polaris Boost (RMK Sled Only) - 140-300 // SKU: 05-140-300 Category_Default Category/SLED/Exhaust/Performance Pipes and shim your valves

and shim your valves

and leaks under the extreme heat and pressure of elevated boost levels

delivering the reliable power required for today's high-demand UTV accessories

Fitment Note: Will NOT fit stock OEM intake panels

Primary Clutch Spring for Polaris Boost (RMK Sled Only) - 140-300 // SKU: 05-140-300 Category_Default Category/SLED/Exhaust/Performance Pipes and shim your valvesPrimary Clutch Spring (140 300) for Polaris Patriot RMK Boost SKU: 05 140 300 IMPORTANT FITMENT NOTE: Designed specifically for Polaris Patriot RMK Boost Mountain Sleds ONLY. Will NOT fit trail boost models (Indy Boost, Switchback Boost, VR1 Boost). Fine tune your clutch engagement and maintain consistent peak shift RPM in deep powder with the Bikeman Performance 140 300 Primary Clutch Spring for Polaris Patriot RMK Boost snowmobiles. The primary