{"product_id":"primary-clutch-spring-140-300-polaris-patriot-9r-short-track-boost-long-track-05-140-300","title":"Primary Drive Clutch Spring (140-300) for Polaris Patriot 9R (Short Track \/ Trail) \u0026 Patriot Boost (Long Track \/ Mountain) \/\/ SKU: 05-140-300","description":"\u003cdiv class=\"bmp-product-description\"\u003e\n  \u003cdiv style=\"background-color: #fff3cd; border-left: 4px solid #ffc107; padding: 12px 15px; margin-bottom: 20px; color: #856404; border-radius: 4px;\"\u003e\n    \u003cp style=\"margin: 0 0 6px 0; font-size: 14px; line-height: 1.4;\"\u003e\n      \u003cstrong\u003e⚠️ CRITICAL FITMENT \u0026amp; APPLICATION ADVISORY:\u003c\/strong\u003e\n    \u003c\/p\u003e\n    \u003cul style=\"margin: 0; padding-left: 20px; font-size: 13px; line-height: 1.5;\"\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePatriot Boost Applications:\u003c\/strong\u003e Calibrated specifically for \u003cstrong\u003ePolaris Patriot RMK Boost Mountain sleds (2.0\"+ lug tracks)\u003c\/strong\u003e. Will \u003cstrong\u003eNOT\u003c\/strong\u003e fit Trail Boost models (Indy VR1 Boost, Switchback Assault Boost).\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePatriot 9R Applications:\u003c\/strong\u003e Calibrated specifically for \u003cstrong\u003ePolaris Patriot 9R Short Track \/ Trail sleds (under 1.75\" lug tracks)\u003c\/strong\u003e. High-altitude RMK 9R mountain sleds require our higher-rate 140-330 primary spring.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003e\u003cb\u003eSKU:\u003c\/b\u003e 05-140-300\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003eSpring Rate:\u003c\/b\u003e 140 lb Initial Load \/ 300 lb Finish Load\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003ePrimary Applications:\u003c\/b\u003e Polaris Patriot RMK Boost (Mountain \/ Deep Powder) \u0026amp; Polaris Patriot 9R (Short Track \/ Trail).\u003c\/p\u003e\n\n  \u003cp\u003eFine-tune your clutch engagement and maintain consistent peak shift RPM under heavy power loads with the Bikeman Performance \u003cb\u003e140-300 Primary Drive Clutch Spring\u003c\/b\u003e. The primary clutch spring controls the RPM threshold at which drive sheaves engage the belt, as well as the progressive resistance against your primary clutch weights as the clutch shifts out through its powerband.\u003c\/p\u003e\n\n  \u003cp\u003eFeaturing a \u003cb\u003e140 lb initial engagement load and a 300 lb finish load\u003c\/b\u003e, this spring profile serves two distinct high-performance setups:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003ePatriot RMK Boost (Mountain):\u003c\/b\u003e Delivers smooth, predictable engagement that prevents track trenching in deep powder off the line, while the 300 lb finish load holds target operating RPM without over-revving or fading during long, steep turbo pulls.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003ePatriot 9R (Trail \/ Short Track):\u003c\/b\u003e Provides crisp, immediate throttle pickup out of trail corners while providing the ideal resistance to hold the high-revving 899cc big-bore twin at its peak horsepower sweet spot across hard-pack trails and lakes.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003eManufactured from premium shot-peened high-tensile alloy spring steel, this primary spring is engineered to withstand extreme under-hood operating temperatures, severe vibration, and rapid compression cycles without sagging, binding, or losing its rate profile over time.\u003c\/p\u003e\n\n  \u003chr\u003e\n\n  \u003ch3\u003eKey Performance Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eDual-Calibrated Performance Profile:\u003c\/b\u003e Engineered specifically for the elevation and power delivery of deep-snow Patriot RMK Boost sleds, as well as corner-to-corner trail acceleration on short-track Patriot 9R models.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003e140-300 Spring Rate Curve:\u003c\/b\u003e The 140 lb initial rate ensures smooth, controlled clutch engagement without abrupt jerking or soft-snow trenching; the 300 lb finish load holds target RPM locked in at wide-open throttle.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eEliminates RPM Fade:\u003c\/b\u003e Resists heat-soak and rate fatigue under continuous full-throttle pulls, keeping your shift-out consistent from morning to late afternoon.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eShot-Peened High-Tensile Steel:\u003c\/b\u003e Premium high-stress alloy construction prevents spring collapse and maintains factory spring height and load ratings across multiple seasons.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr\u003e\n\n  \u003ch3\u003eVehicle Fitment \u0026amp; Compatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003ePolaris Patriot RMK Boost (Mountain Chassis Only — 2022+):\u003c\/b\u003e\n      \u003cul\u003e\n        \u003cli\u003ePRO-RMK Boost (155, 163, 165)\u003c\/li\u003e\n        \u003cli\u003eRMK Khaos Boost (146, 155, 163, 165)\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003ePolaris Patriot 9R (Trail \u0026amp; Short Track Models — 2023+):\u003c\/b\u003e\n      \u003cul\u003e\n        \u003cli\u003eSwitchback Assault 9R (146 with trail lug tracks)\u003c\/li\u003e\n        \u003cli\u003eIndy XCR 9R \/ VR1 9R trail configurations\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eFitment Exclusions:\u003c\/b\u003e\n      \u003cul\u003e\n        \u003cli\u003eDoes \u003cstrong\u003eNOT\u003c\/strong\u003e fit Trail Boost models (Indy VR1 Boost, Switchback Assault Boost).\u003c\/li\u003e\n        \u003cli\u003eDoes \u003cstrong\u003eNOT\u003c\/strong\u003e fit Patriot 9R Mountain RMK models running 2.0\"+ lug tracks (requires SKU: 05-140-330).\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":50998308176165,"sku":"05-140-300","price":27.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6436\/9701\/files\/05-140-300.png?v=1755803402","url":"https:\/\/www.bikemanperformance.com\/products\/primary-clutch-spring-140-300-polaris-patriot-9r-short-track-boost-long-track-05-140-300","provider":"Bikeman Performance","version":"1.0","type":"link"}