QRS Secondary Clutch Spring (205-310) for Ski-Doo Gen4 & Gen5 850 E-TEC // SKU: 05-QRSS-205310
⚙️ SPRING RATE SPECIFICATION: Calibrated with a 205 lb initial load and a 310 lb finish load. Engineered specifically for Ski-Doo QRS secondary clutches operating at 0–6,000 ft elevations to manage full sea-level engine torque and prevent belt slippage.
SKU: 05-QRSS-205310
Spring Rate: 205 lb Initial Load / 310 lb Finish Load
Clutch Compatibility: Ski-Doo OEM QRS Secondary / Driven Clutches
Elevation Range: 0 to 6,000 Feet (Sea Level to Mid-Elevation)
Primary Application: Ski-Doo REV Gen4 (2017–2022) & REV Gen5 (2023+) 850 E-TEC snowmobiles (Summit, Freeride, Backcountry, Renegade, and MXZ models).
Eliminate secondary belt slip and unlock aggressive corner-to-corner backshifting with the Bikeman Performance QRS Secondary Clutch Spring (205-310). 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.
Our 205-310 spring rate delivers an immediate upgrade in belt clamping force. The firm 205 lb initial seat load 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 310 lb finish load 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.
Manufactured 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.
Key Performance Features
- Low-Elevation Torque Management: Specifically calibrated to balance sea-level 850 E-TEC engine torque against drive belt grip across flatland, trail, and low-altitude mountain riding.
- 205-310 Load Dynamic: 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.
- Drastic Belt Heat Reduction: By stopping secondary belt slippage, sheave face and drive belt surface temperatures drop significantly, preventing premature belt failure.
- High-Tensile Chrome-Silicon Alloy: Shot-peened and preset to resist heat-soak fatigue and eliminate spring rate sag season after season.
- Drop-In QRS Fitment: Engineered to install directly into factory Ski-Doo QRS driven clutches without machining or modification.
- Essential Kit Component: This is the exact secondary spring included in our Ski-Doo 850 E-TEC Low Elevation Stage 2 Clutch Kits (Long Track and Short Track configurations).
Fitment & Installation Notes
- Compatible Sled Platforms: 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).
- Recommended Washer Pairing: For the smoothest possible shift action, pair this spring with our Smooth Shift Secondary PTFE Teflon Washers (3-Pack, SKU: 05-TW-201-3) to completely eliminate torsional spring bind inside the QRS cup.
- Required Tooling: Requires a standard Ski-Doo QRS secondary clutch compression tool for safe spring cup compression and snap ring removal.