QRS XP2 Progressive Secondary Clutch Helix for Ski-Doo 850 E-TEC (Long Track / Mountain - Low Elevation) // SKU: 05-XP2

SKU: 05-XP2

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 & Gen5 850 E-TEC mountain sleds (Summit & Freeride) riding at 0–6,000 ft.

Harness the full sea-level horsepower and torque of the 850 E-TEC engine with the Bikeman Performance QRS XP2 Progressive Secondary Clutch Helix. Between 0 and 6,000 feet, the naturally aspirated 850 twin produces maximum cylinder pressure and broad torque. Without a secondary helix ramp contoured to manage that low-altitude power against tall, deep-lug mountain tracks, stock sheaves allow the belt to slip under aggressive acceleration, causing premature upshift hesitation, sluggish corner-to-corner recovery, and severe belt-glazing heat.

The XP2 progressive angle profile is engineered to load the 850 engine harder across low-altitude backcountry conditions. It initiates shift-out with an aggressive launch ramp that drives the belt deep into the clutches for violent holeshot acceleration, then transitions progressively to a shallower clamp angle that locks the drive belt tight between the sheaves under full power. This balanced progression delivers crisp, instantaneous backshifting the second you chop the throttle to navigate tight technical tree lines or sidehill lines.

Key Performance Features

• Low-Elevation Mountain Profile: Specifically profiled to convert full sea-level 850 E-TEC torque into explosive track speed on 2.0"+ lug mountain sleds without blowing past the peak powerband.
• Progressive Dual-Angle Design: Launches hard off the bottom and smoothly transitions into a high-pressure clamp angle to prevent belt slippage during wide-open-throttle climbing.
• Instantaneous Backshifting: Squeezes back down on the belt instantly when you dump and re-engage the throttle, keeping the 850 E-TEC pinned in its 7,900–8,000 RPM sweet spot without bogging.
• Substantial Belt Heat Reduction: Eliminating secondary slip slashes sheave and belt surface temperatures, dramatically extending drive belt lifespan under heavy snow drag.
• Aerospace-Grade Billet Aluminum: Precision CNC-machined from high-tensile billet aluminum to hold micro-tolerances, resist ramp deflection, and prevent roller grooving.
• Essential Kit Component: This is the exact secondary helix included in our Ski-Doo 850 E-TEC Long Track Low Elevation Stage 2 Clutch Kit.

Fitment & Installation Notes

• Vehicle Compatibility: Fits all 2017+ Ski-Doo REV Gen4 and Gen5 850 E-TEC mountain models (Summit, Summit Expert, Freeride) equipped with factory QRS driven clutches.
• Recommended Maintenance Upgrade: We strongly advise inspecting your secondary clutch rollers during helix installation. Upgrading to our Heavy-Duty BRP QRS Secondary Clutch Rollers prevents premature flat-spotting and roller failure common to the OEM composite rollers.
• Clutch Tooling: Requires a standard Ski-Doo QRS secondary clutch compression tool for safe disassembly and reassembly.