{"product_id":"qrs-secondary-clutch-spring-205-310-ski-doo-gen4-gen5-850-e-tec-05-qrss-205310","title":"QRS Secondary Clutch Spring (205-310) for Ski-Doo Gen4 \u0026 Gen5 850 E-TEC \/\/ SKU: 05-QRSS-205310","description":"\u003cdiv class=\"bmp-product-description\"\u003e\n  \u003cdiv style=\"background-color: #f8f9fa; border-left: 4px solid #0056b3; padding: 12px 15px; margin-bottom: 20px; color: #212529; border-radius: 4px;\"\u003e\n    \u003cp style=\"margin: 0; font-size: 14px; line-height: 1.4;\"\u003e\n      \u003cstrong\u003e⚙️ SPRING RATE SPECIFICATION:\u003c\/strong\u003e Calibrated with a \u003cstrong\u003e205 lb initial load and a 310 lb finish load\u003c\/strong\u003e. Engineered specifically for Ski-Doo QRS secondary clutches operating at \u003cstrong\u003e0–6,000 ft elevations\u003c\/strong\u003e to manage full sea-level engine torque and prevent belt slippage.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003e\u003cb\u003eSKU:\u003c\/b\u003e 05-QRSS-205310\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003eSpring Rate:\u003c\/b\u003e 205 lb Initial Load \/ 310 lb Finish Load\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003eClutch Compatibility:\u003c\/b\u003e Ski-Doo OEM QRS Secondary \/ Driven Clutches\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003eElevation Range:\u003c\/b\u003e 0 to 6,000 Feet (Sea Level to Mid-Elevation)\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003ePrimary Application:\u003c\/b\u003e Ski-Doo REV Gen4 (2017–2022) \u0026amp; REV Gen5 (2023+) 850 E-TEC snowmobiles (Summit, Freeride, Backcountry, Renegade, and MXZ models).\u003c\/p\u003e\n\n  \u003cp\u003eEliminate secondary belt slip and unlock aggressive corner-to-corner backshifting with the Bikeman Performance \u003cb\u003eQRS Secondary Clutch Spring (205-310)\u003c\/b\u003e. In low-elevation riding environments (0–6,000 ft), dense atmospheric air allows the naturally aspirated 850 E-TEC to produce peak cylinder pressure and torque. Under full sea-level acceleration, the factory secondary spring often lacks the side-pressure required to clamp the drive belt firmly against the sheaves, leading to belt scrub, high friction heat, and inconsistent shift speeds.\u003c\/p\u003e\n\n  \u003cp\u003eOur \u003cb\u003e205-310 spring rate\u003c\/b\u003e delivers an immediate upgrade in belt clamping force. The firm \u003cb\u003e205 lb initial seat load\u003c\/b\u003e prevents the drive belt from being pulled too deep into the secondary pulley off the line, maintaining optimal mechanical leverage. As the clutch shifts through its stroke, the stout \u003cb\u003e310 lb finish load\u003c\/b\u003e works in unison with our progressive XP2 helix to resist sheave separation, keeping the belt pinned tightly under wide-open-throttle load while providing razor-sharp, instantaneous backshifting the second you let off the throttle.\u003c\/p\u003e\n\n  \u003cp\u003eManufactured from premium shot-peened, high-tensile chrome-silicon alloy spring steel, this driven spring withstands extreme under-hood heat cycles and rapid compression cycling without collapsing, binding, or losing its calibrated rate across thousands of trail and off-trail miles.\u003c\/p\u003e\n\n  \u003chr\u003e\n\n  \u003ch3\u003eKey Performance Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eLow-Elevation Torque Management:\u003c\/b\u003e Specifically calibrated to balance sea-level 850 E-TEC engine torque against drive belt grip across flatland, trail, and low-altitude mountain riding.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003e205-310 Load Dynamic:\u003c\/b\u003e 205 lb initial load eliminates off-idle belt slip; 310 lb finish load maintains firm sheave clamp force and accelerates backshifting during aggressive throttle chops.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eDrastic Belt Heat Reduction:\u003c\/b\u003e By stopping secondary belt slippage, sheave face and drive belt surface temperatures drop significantly, preventing premature belt failure.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eHigh-Tensile Chrome-Silicon Alloy:\u003c\/b\u003e Shot-peened and preset to resist heat-soak fatigue and eliminate spring rate sag season after season.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eDrop-In QRS Fitment:\u003c\/b\u003e Engineered to install directly into factory Ski-Doo QRS driven clutches without machining or modification.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eEssential Kit Component:\u003c\/b\u003e This is the exact secondary spring included in our \u003cb\u003eSki-Doo 850 E-TEC Low Elevation Stage 2 Clutch Kits\u003c\/b\u003e (Long Track and Short Track configurations).\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr\u003e\n\n  \u003ch3\u003eFitment \u0026amp; Installation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eCompatible Sled Platforms:\u003c\/b\u003e Fits all 2017+ Ski-Doo REV Gen4 and Gen5 models equipped with factory QRS driven clutches (850 E-TEC, 850 Turbo, 600R E-TEC, and 900 ACE Turbo).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eRecommended Washer Pairing:\u003c\/b\u003e For the smoothest possible shift action, pair this spring with our \u003cb\u003eSmooth Shift Secondary PTFE Teflon Washers (3-Pack, SKU: 05-TW-201-3)\u003c\/b\u003e to completely eliminate torsional spring bind inside the QRS cup.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eRequired Tooling:\u003c\/b\u003e Requires a standard Ski-Doo QRS secondary clutch compression tool for safe spring cup compression and snap ring removal.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":51556646322469,"sku":"05-QRSS-205310","price":27.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6436\/9701\/files\/05-QRSS-205310.png?v=1762970564","url":"https:\/\/www.bikemanperformance.com\/products\/qrs-secondary-clutch-spring-205-310-ski-doo-gen4-gen5-850-e-tec-05-qrss-205310","provider":"Bikeman Performance","version":"1.0","type":"link"}