{"product_id":"stage-2-performance-kit-for-polaris-patriot-850-long-track-mountain-sleds-sku-13-310-2-m","title":"Stage 2 Performance Kit for Polaris Patriot 850 (Long Track \/ Mountain Sleds) \/\/ SKU: 13-310-2-M","description":"\u003ch3\u003eStage 2 Performance Kit for Polaris Patriot 850 (Long Track \/ Mountain Sleds) \/\/ SKU: 13-310-2-M\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003ePrimary Application:\u003c\/b\u003e Polaris RMK, PRO-RMK, Khaos, SKS, and Switchback Assault models equipped with \u003cb\u003e2.0\" or deeper lug tracks\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp\u003eUnleash a massive \u003cb\u003e20 to 21 peak horsepower gain\u003c\/b\u003e and up to \u003cb\u003e22 to 24 mid-range horsepower gain over stock\u003c\/b\u003e on your long-track Polaris Patriot 850 with the Bikeman Performance \u003cb\u003eStage 2 Performance Kit\u003c\/b\u003e. Designed for serious mountain riders who demand maximum bolt-on horsepower, this ultimate performance package adds our CNC-machined Billet Cylinder Head Kit to our proven full-pipe, cooling, and clutching foundation.\u003c\/p\u003e\n\u003cp\u003eFactory cylinder heads suffer from restricted coolant passages and tight squish bands that trap localized heat, easily triggering the stock detonation (DET) sensor and throwing your sled into power-limiting limp mode. The Stage 2 Kit overhauls combustion cooling, exhaust scavenging, ECU fuel\/timing mapping, and primary clutch heat dissipation—keeping your engine pinned directly in its peak powerband without DET activation or power sag.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003e1. Choose Your Digital Tuning Platform\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eSelect your preferred tuning delivery method from the dropdown options on this page to load Bikeman's custom Patriot 850 Stage 2 performance calibration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eOption A: \u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/torque-link-pro-bundle-for-polaris-rzr-turbo-r-and-pro-xp-device-license-cables\" target=\"_blank\"\u003eTorque Link Pro\u003c\/a\u003e (Mobile Smartphone Tuning):\u003c\/b\u003e 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.\u003cbr\u003e\n\u003cb style=\"color: #ef1c1c;\"\u003e*REQUIRED POLARIS HARDWARE NOTE:*\u003c\/b\u003e \u003ci\u003eFlashing 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.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eOption B: \u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/polaris-boost-ecu-hard-flash\" target=\"_blank\"\u003eECU Hard Flash\u003c\/a\u003e (Send-In Bench Service):\u003c\/b\u003e The seamless \"set-it-and-forget-it\" setup. Simply remove your ECU and mail it directly to our facility. Bikeman calibration specialists will flash our custom tune file directly to your module, clone your vehicle data, and ship it right back ready to plug in and ride.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003e2. Select Your Billet Head Dome Elevation Specification\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eEvery Stage 2 Kit includes our \u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/polaris-patriot-9r-850-billet-head\" target=\"_blank\"\u003eBillet Cylinder Head Kit (SKU: 04-318)\u003c\/a\u003e. Please select your primary riding elevation from the dropdown options on this page to configure your drop-in billet domes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eLow Altitude Domes (0–6,000 ft \/ 40.5cc \/ 11.8:1 Comp) \/\/ SKU: 04-318-L:\u003c\/b\u003e Engineered for low-to-mid elevation mountain riding and crossover setups running premium 91 pump gas. Slightly lowers stock compression to suppress the DET sensor, allowing safe fuel map leaning for maximum, reliable power gains (+4–5 HP from head alone).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eHigh Altitude Domes (6,000–9,000+ ft \/ 36.5cc \/ 12.5:1 Comp) \/\/ SKU: 04-318-H:\u003c\/b\u003e High-compression mountain domes engineered specifically to restore lost cylinder pressure and maximize power in thin air (+7–8 HP mid-range \/ +5–6 HP peak from head alone).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003e3. Performance Bolt-On Hard Parts Included\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/polaris-patriot-9r-850-billet-head\" target=\"_blank\"\u003eBillet Cylinder Head Cover \u0026amp; Domes\u003c\/a\u003e (SKU: 04-318):\u003c\/b\u003e CNC-machined 6061 billet head shell with interchangeable domes designed to optimize squish band clearance, increase coolant volume, and completely eliminate DET sensor activation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/pipe-only-polaris-850-9r\" target=\"_blank\"\u003eFatt Azz Single Expansion Pipe\u003c\/a\u003e (SKU: 01-328):\u003c\/b\u003e High-volume expansion chamber finished in 1,300°F polished ceramic coating to maximize exhaust scavenging, build internal pipe heat rapidly, and unleash broad power gains.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/polaris-patriot-850-stinger\" target=\"_blank\"\u003eFast Reaction High-Altitude Internal Pipe Stinger\u003c\/a\u003e (Part #: 01-328-H):\u003c\/b\u003e Comes automatically included with the Fatt Azz pipe package. Regulates expansion chamber backpressure to ensure razor-sharp off-idle throttle response and consistent peak RPM in thin mountain air.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/performance-manifold-for-polaris-patriot-boost-850-and-9r-sku-03-302-c\" target=\"_blank\"\u003eCeramic Performance Exhaust Manifold (Y-Pipe)\u003c\/a\u003e (SKU: 03-302-C):\u003c\/b\u003e High-flow manifold that eliminates internal exhaust turbulence, reduces cylinder heat retention, and carries peak RPM further into over-rev.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/cyclone-clutch-cover-polaris-p85\" target=\"_blank\"\u003eBillet Cyclone Primary Clutch Cover\u003c\/a\u003e (SKU: 05-CYCLONE-1):\u003c\/b\u003e 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.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/stage-2-snypr-clutch-kit-for-polaris-patriot-850-long-track-mountain-sleds-sku-06-37-302\" target=\"_blank\"\u003eComplete Stage 2 SNYPR Mountain Clutch Kit\u003c\/a\u003e (SKU: 06-37-302):\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/snypr-clutch-weights-for-polaris-snowmobiles-sku-05-haw-5889\" target=\"_blank\"\u003eSNYPR Adjustable Primary Clutch Weight Set\u003c\/a\u003e (Includes tuning magnets, set screws \u0026amp; tungsten slugs)\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/primary-clutch-spring-140-330-sku-05-140-330\" target=\"_blank\"\u003ePrimary Drive Clutch Spring (140-330 Rate)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/secondary-clutch-spring-160-260-sku-05-160-260\" target=\"_blank\"\u003eSecondary Driven Clutch Spring (160-260 Rate)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/bmp-1-trail-helix-for-polaris-patriot-850-sku-05-tss-1\" target=\"_blank\"\u003eCustom Cut Mountain Helix (Part #: 05-TSS-1)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/smooth-shift-secondary-teflon-washers-2-pack-05-tw-301-2\" target=\"_blank\"\u003eSmooth Shift Secondary Teflon Washers (2-Pack)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/products\/tss-04-small-rollers-for-dual-cut-helix\" target=\"_blank\"\u003eSmall Secondary Clutch Rollers for TSS \/ Polaris\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.bikemanperformance.com\/pages\/clutch-setup-guides\" target=\"_blank\"\u003eComprehensive Clutch Setup Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eKey Performance Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e+20-21 Peak HP \u0026amp; +22-24 Mid-Range HP Gains:\u003c\/b\u003e Massive dyno-proven power increases across the entire RPM band by combining full-pipe exhaust, billet head cooling, and custom digital tuning.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCooler Combustion \u0026amp; DET Sensor Suppression:\u003c\/b\u003e Billet head shell with expanded coolant volume eliminates localized cylinder hot spots, keeping your engine out of limp mode on hard pulls.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eActive Clutch Cooling Technology:\u003c\/b\u003e Billet Cyclone cover forces continuous cool airflow over primary sheaves to eliminate belt heat-soak and ensure stable shift RPM.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eHolds Peak Mountain RPM:\u003c\/b\u003e Eliminates powerband sag and engine bog under extreme snow drag and steep incline resistance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eLightning-Quick Powder Backshift:\u003c\/b\u003e Instantly downshifts when cycling the throttle in technical terrain, putting track horsepower right back on tap without trenching.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eVehicle Fitment \u0026amp; Lug Depth Rules\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eSKU:\u003c\/b\u003e 13-310-2-M\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCompatible Sled Models:\u003c\/b\u003e Fits all Polaris RMK, PRO-RMK, Khaos, SKS 146 \/ 155, and Switchback Assault models equipped with \u003cb\u003e2.0\" or deeper lug tracks\u003c\/b\u003e across all chassis platforms (AXYS \u0026amp; Matryx, 2019+).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eTRACK LUG CUTOFF RULE:\u003c\/b\u003e \u003cb style=\"color: #ef1c1c;\"\u003eANY Polaris Patriot 850 running a 2.0\" or deeper lug track MUST use this mountain kit configuration.\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCRITICAL CHASSIS EXCLUSION:\u003c\/b\u003e Does NOT fit Hill Climb Racer (RMSHA \/ HCR) competition chassis models due to modified shock tower and bulkhead clearances.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eFuel Requirement:\u003c\/b\u003e Minimum 91-octane premium pump gas required for both dome options.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eTuning Note:\u003c\/b\u003e \u003ci\u003eIncluded setup sheets provide baseline weighting guidelines. Minor set-screw or magnet adjustments may be required depending on rider weight, altitude, and specific engine modifications.\u003c\/i\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":53790636179749,"sku":"13-310-2","price":2435.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6436\/9701\/files\/13-310-2-M.webp?v=1788895894","url":"https:\/\/www.bikemanperformance.com\/products\/stage-2-performance-kit-for-polaris-patriot-850-long-track-mountain-sleds-sku-13-310-2-m","provider":"Bikeman Performance","version":"1.0","type":"link"}