Primary Clutch Spring for Polaris Boost (RMK Sled Only) - 140-300 // SKU: 05-140-300 xp turbo Function: Controls internal expansion chamber

Function: Controls internal expansion chamber backpressure and exhaust gas velocity

Maximized Cold Airflow: Directs dense

This allows the internal agitator to create a dense foam that is stickier than the Chinese knock-off foam cannons

Compatible with our 90 Degree turn-outs HERE

Level 3 - Big Injector Tune - 91 Non-Ethanol/Non-Oxygenated or 93 Octane - 150 RWHP (+45 RWHP) **BMP Exhaust Required**

Primary Clutch Spring for Polaris Boost (RMK Sled Only) - 140-300 // SKU: 05-140-300 xp turbo Function: Controls internal expansion chamberPrimary 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