Stage 2 Performance Kit for Polaris Patriot 850 (Short Track Sleds) // SKU: 13-310-2-T

SEND-IN PIPE MODIFICATION NOTICE: This kit includes our Factory Pipe Mod service (SKU: 01-608). You must send your factory OEM Polaris expansion pipe and heat shield to our St. Croix Falls facility to be modified for this setup. Stage 2 Performance Kit for Polaris Patriot 850 (Short Track Sleds) // SKU: 13-310-2-T Primary Application: Polaris Indy, VR1, XCR, Pro-S, Pro-X, and Switchback Assault models equipped with 1.25" to 1.6" lug tracks. Transform your short-track Polaris Patriot 850 into the ultimate trail missile with the Bikeman Performance Stage 2 Performance Kit. Engineered specifically for trail and crossover riders who demand maxed-out horsepower, aggressive corner-exit acceleration, and high-speed stability, this kit combines our CNC-machined Billet Cylinder Head (equipped with Low Elevation Domes), Factory Pipe Modification, Ceramic Y-Pipe, Billet Cyclone Clutch Cover, Stage 2 SNYPR Short Track Clutch Kit, and custom ECU digital tuning into one synchronized package. Stock cylinder heads suffer from restricted coolant flow and hot spots that trigger the sensitive OEM detonation (DET) sensor, while stock exhaust chambers fade under repeated hard pulls. The Stage 2 Kit overhauls cylinder cooling, increases peak shift RPM by +350 (elevating your operating window to 8400–8600 RPM), and keeps your primary clutch running up to 50°F cooler for relentless, back-to-back pull power on the trail. 1. Choose Your Digital Tuning Platform Select your preferred tuning delivery method from the dropdown options on this page to load Bikeman's custom Patriot 850 Stage 2 performance calibration: Option A: Torque Link Pro (Mobile Smartphone Tuning): The ultimate next-generation mobile tuning platform. Flash your Patriot 850 directly from your Apple or Android smartphone via Bluetooth/Wi-Fi with zero computer required. Grants full access to tune libraries, real-time diagnostic engine logging, and fault code clearing trailside. *REQUIRED POLARIS HARDWARE NOTE:* Flashing Polaris snowmobile ECUs via Torque Link requires both the Torque Link Data Cable AND the Polaris ECU Power Cable for proper communication and voltage supply during the flash process. Option B: ECU Hard Flash (Send-In Bench Service): The seamless "set-it-and-forget-it" setup. Simply remove your ECU and mail it directly to our facility along with your expansion pipe. Bikeman calibration specialists will flash our custom tune file directly to your module and ship it back ready to plug in and ride. 2. Performance Bolt-On Hard Parts Included Billet Cylinder Head Kit with Low Elevation Domes (SKU: 04-318-L): CNC-machined 6061 billet head shell paired with our Low Altitude Domes (0–6,000 ft / 40.5cc / 11.8:1 Comp). Engineered specifically for trail and crossover setups running premium 91 pump gas, this setup slightly lowers stock compression to suppress the DET sensor, allowing safe fuel map leaning for maximum, reliable trail power gains. Factory Expansion Pipe Modification Service (SKU: 01-608): Send us your stock pipe! Our fabrication team modifies internal geometry and outlet dimensions to accept our stinger system, boosting peak RPM to 8400–8600 while retaining factory heat shields for a sleeper under-hood look. Ceramic Performance Exhaust Manifold (Y-Pipe) (SKU: 03-302-C): High-flow manifold that eliminates internal exhaust turbulence, reduces cylinder heat retention, and carries peak RPM further into over-rev. Billet Cyclone Primary Clutch Cover (SKU: 05-CYCLONE-1): USA-made 6061 billet cover with integrated fan blades that actively draw cooling air across drive sheaves to drop clutch temps by 30°F to 50°F. Complete Stage 2 SNYPR Short Track Clutch Kit (SKU: 06-37-301): SNYPR Adjustable Primary Clutch Weight Set (Includes tuning magnets, set screws & tungsten slugs) Primary Drive Clutch Spring (120-310 Rate) Secondary Driven Clutch Spring (140-220 Rate) Custom Cut Short Track Helix (Part #: 05-TSS-4) Smooth Shift Secondary Teflon Washers (2-Pack) Small Secondary Clutch Rollers for TSS / Polaris Comprehensive Clutch Setup Guide Key Performance Features Maximum Trail Horsepower Gains: Combines billet combustion cooling, modified exhaust velocity, and custom digital tuning for massive top-end speed and arm-stretching corner exit pull. +350 RPM Operating Window: Pipe modification elevates peak shift RPM to 8400–8600 RPM without horsepower dropping off on long trail sweeps. DET Sensor Suppression: Enhanced coolant capacity in the billet head eliminates cylinder hot spots, keeping your engine from pulling timing or throwing fault codes. Active Clutch Cooling Technology: Billet Cyclone cover forces continuous cool airflow over primary sheaves to eliminate belt heat-soak and belt glazing. Lightning-Quick Corner Backshift: Custom trail helix profile downshifts instantly when chopping the throttle into turns, putting track power right back on tap. Vehicle Fitment & Lug Depth Rules SKU: 13-310-2-T Compatible Sled Models: Indy, VR1, XCR, Pro-S, Pro-X, and Switchback Assault models equipped with 1.25" to 1.6" lug tracks across all chassis platforms (AXYS & Matryx, 2019+). TRACK LUG CUTOFF RULE: Designed specifically for short-track and mid-track trail models running tracks under 1.75" in lug depth. CRITICAL FITMENT EXCLUSIONS: Switchback Assault 144 models equipped with a 2.0" lug track MUST use the Stage 2 Performance Kit for Long Track / Mountain Sleds (SKU: 13-310-2-M). Does NOT fit Hill Climb Racer (RMSHA / HCR) competition chassis models. Fuel Requirement: Minimum 91-octane premium pump gas required. Tuning Note: Included setup sheets provide baseline weighting guidelines. Minor set-screw or magnet adjustments may be required depending on rider weight, track length, altitude, and specific engine modifications.