{"product_id":"primary-drive-clutch-spring-173-385-ski-doo-850-e-tec-pdrive-mountain-05-173-385","title":"Primary Drive Clutch Spring (173-385) for Ski-Doo 850 E-TEC pDrive (Long Track \/ Mountain) \/\/ SKU: 05-173-385","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\u003e173 lb initial engagement load and a 385 lb finish load\u003c\/strong\u003e. Color-coded with a durable \u003cstrong\u003eBlack body and Purple stripe\u003c\/strong\u003e for rapid identification during bench tuning and field checks.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003e\u003cb\u003eSKU:\u003c\/b\u003e 05-173-385\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003eColor Code:\u003c\/b\u003e Black \/ Purple Stripe\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003eSpring Rate:\u003c\/b\u003e 173 lb Initial Load \/ 385 lb Finish Load\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003eClutch Compatibility:\u003c\/b\u003e Ski-Doo pDrive Primary Drive Clutches\u003c\/p\u003e\n  \u003cp\u003e\u003cb\u003ePrimary Application:\u003c\/b\u003e Ski-Doo REV Gen4 \u0026amp; Gen5 850 E-TEC mountain snowmobiles (Summit and Freeride models).\u003c\/p\u003e\n\n  \u003cp\u003eMaximize power transfer, sharpen throttle pickup, and lock in consistent shift-out RPM with the Bikeman Performance \u003cb\u003e173-385 Primary Drive Clutch Spring\u003c\/b\u003e for Ski-Doo pDrive clutches. Designed specifically for the high-load demands of long-track mountain sleds operating at high elevations, this spring manages initial clutch engagement and provides the critical finish force required to hold the 850 E-TEC engine right in its 7,900–8,000 RPM peak horsepower band.\u003c\/p\u003e\n\n  \u003cp\u003eThe aggressive \u003cb\u003e173 lb initial load\u003c\/b\u003e raises engagement RPM slightly to deliver crisp, instant track spin that gets deep-lug tracks up on the snow immediately without bogging or hesitating. As the pDrive shifts out under heavy deep-snow loads, the stiff \u003cb\u003e385 lb finish load\u003c\/b\u003e resists the outward force of the clutch weights, preventing the clutch from shifting prematurely into overdrive and maintaining peak climbing momentum on sustained mountain pulls.\u003c\/p\u003e\n\n  \u003cp\u003eManufactured from premium shot-peened, high-tensile chrome-silicon alloy spring steel, this primary spring is engineered to withstand extreme heat cycles, rapid compression rates, and severe harmonic vibration without sagging, binding, or losing its rate profile across multiple seasons.\u003c\/p\u003e\n\n  \u003chr\u003e\n\n  \u003ch3\u003eKey Performance Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cb\u003eHigh-Elevation Mountain Calibration:\u003c\/b\u003e Engineered to complement high-altitude track load, steep incline drag, and reduced atmospheric engine horsepower on deep-snow Summit and Freeride sleds.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003e173-385 Spring Rate Dynamics:\u003c\/b\u003e 173 lb initial rate delivers responsive off-idle track pop, while the 385 lb finish load controls upshift speed and prevents high-load RPM fade.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eShot-Peened Chrome-Silicon Alloy:\u003c\/b\u003e Premium spring steel resists fatigue, collapse, and heat sag, maintaining factory load ratings through long backcountry riding seasons.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eBlack \u0026amp; Purple Stripe Identification:\u003c\/b\u003e Easy-to-read color coding ensures quick verification in the shop or trailside gear bag.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eEssential Kit Component:\u003c\/b\u003e This is the exact primary spring included in our \u003cb\u003eSki-Doo 850 E-TEC Long Track High Elevation Stage 2 Clutch Kit\u003c\/b\u003e (paired with the factory OEM secondary spring).\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 Models:\u003c\/b\u003e Fits all 2017+ Ski-Doo REV Gen4 and Gen5 850 E-TEC mountain snowmobiles equipped with the factory pDrive primary clutch (Summit, Summit Expert, Freeride).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eSecondary Spring Pairing:\u003c\/b\u003e Our high-elevation long-track clutching configuration is specifically calibrated to run this 173-385 primary spring in combination with the \u003cb\u003estock factory Ski-Doo secondary spring\u003c\/b\u003e and our XP4 progressive helix.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eInstallation Tooling:\u003c\/b\u003e Requires a standard pDrive clutch spring compressor for safe removal and installation of the primary spring cup retainer.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":51755890802981,"sku":"05-173-385","price":27.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6436\/9701\/files\/05-173-385.webp?v=1765819225","url":"https:\/\/www.bikemanperformance.com\/products\/primary-drive-clutch-spring-173-385-ski-doo-850-e-tec-pdrive-mountain-05-173-385","provider":"Bikeman Performance","version":"1.0","type":"link"}