Segment:
Deep Snow / Mountain Snowmobile
Target User:
Enthusiast riders and mechanics focused on performance and reliability in challenging terrain
Competitors:
Arctic Cat M Series, Ski-Doo Summit
Rmk Design Philosophy:
Lightweight, agile, and purpose-built for climbing and navigating deep snow conditions with an emphasis on rider-forward ergonomics and track flotation.
Engine System:
Detailed overhaul, troubleshooting, component testing, lubrication, cooling system, exhaust system, fuel system (carburetion/injection depending on exact spec)
Transmission System:
CVT clutch service, belt replacement, gearbox inspection and maintenance
Chassis And Suspension:
Front and rear suspension geometry, shock absorber servicing, track system inspection and adjustment, skis, steering components
Electrical System:
Ignition system diagnostics, lighting, starter, battery, stator, wiring diagrams, ECU troubleshooting
Brakes:
Hydraulic brake system service, caliper overhaul, rotor inspection, fluid replacement
Bodywork And Trim:
Panel removal and installation, seat, handlebars, cowling, graphics
Maintenance Procedures:
Regular scheduled maintenance, pre-ride inspections, seasonal storage and preparation
Repair Procedures:
Step-by-step guides for component replacement and repair, engine rebuilds, suspension component replacement
Troubleshooting Guides:
Systematic diagnostic procedures for common and uncommon issues, fault code interpretation (if applicable)
Technical Specifications:
Torque values, clearances, fluid capacities, electrical specifications, performance data
Depth:
Comprehensive (Suitable for professional technicians and advanced DIY mechanics)
Engine Type:
2-stroke, parallel-twin cylinder, liquid-cooled
Displacement:
599 cc (approximate, based on common Polaris 600 engines of the era)
Bore X Stroke:
72.1 mm x 73.2 mm (Typical for Polaris Liberty 600 twin)
Ignition System:
CDI (Capacitor Discharge Ignition), likely with electronic advance
Horsepower Rating:
Approx. 125-135 HP (Varies slightly by specific tune)
Cooling System:
Liquid-cooled
Fuel Delivery:
Likely fuel injected (Cleanfire Injection) or Mikuni VM carburetors, manual will specify exact configuration.
Fuel Type:
Premium Unleaded Gasoline (91 Octane or higher recommended)
Oil Mixture:
Autolube (Oil injection system), manual will specify Polaris-branded 2-stroke oil.
Type:
CVT (Continuously Variable Transmission) with Polaris P-85 drive clutch and AD clutch
Optional Transmissions:
N/A (Snowmobiles typically have a standard CVT)
Gear Reduction:
Integrated into the CVT system, manual will detail specific ratios.
Drive System:
Chaincase for final drive, manual will specify chain type and tensioning procedure.
Track Width:
15 inches (Typical for RMK models)
Track Lug Height:
2.25 inches or 2.5 inches (Common for deep snow RMK variants, manual will confirm)
Dry Weight:
Approx. 450-470 lbs (Varies by specific options, manual will provide exact spec)
Fuel Capacity:
Approx. 10-11 gallons (Manual will confirm)
Crash Test Ratings:
N/A (Snowmobiles are not typically rated by NHTSA or IIHS)
Braking System:
Hydraulic disc brake with braided steel lines
Throttle Control:
Thumb throttle with adjustable tension
Kill Switch:
Emergency engine shut-off switch (often tethered)
Windshield:
High-profile windshield for rider protection
Handlebars:
ProTaper handlebars for improved control and reduced fatigue
Instrument Panel:
Digital or analog gauges for speedometer, tachometer, odometer, trip meter, fuel level, coolant temperature. May include warning lights.
Rider Aids:
Limited in this era; focus is on chassis design and suspension for handling. No electronic rider aids like traction control or ABS are typically found.
Connectivity Features:
N/A (No integrated Bluetooth or advanced connectivity in 2012 models)
Initial Break In:
First 5-10 hours (refer to manual for specific break-in procedures for engine and clutches)
Oil Change:
For gearbox oil: typically every 100-150 hours or annually. For 2-stroke oil injection reservoir: as needed.
Spark Plug Replacement:
Every 100-150 hours or as recommended by plug manufacturer.
Clutch Maintenance:
Inspect drive belts every 25-50 hours; check clutch alignment and sheave condition regularly.
Gearcase Oil:
Polaris Gearcase Lubricant (GL-2), or equivalent SAE 80W-90 API GL-4 gear oil. Manual will specify part number.
Coolant:
Ethylene glycol-based antifreeze (e.g., Polaris Premium 2-Stroke Coolant or a 50/50 mix of distilled water and quality antifreeze). Manual will specify type and capacity.
2 Stroke Oil:
Polaris Premium 2-Stroke Synthetic Oil (or specified alternative). Manual will list part number and type.
Common Wear Items:
Drive belts (due to high stress in deep snow), carbides on skis, shock absorber seals, track lugs (depending on terrain).
Engine Considerations:
Proper clutch calibration and engine cooling are critical for longevity. Overheating can lead to piston/cylinder damage. Monitor exhaust temp and ensure adequate airflow.
Storage Preparation:
Fuel stabilizer, fogging oil (optional), battery tender, clean and lubricate moving parts before storage.
Polaris Legacy:
Polaris Industries Inc. is a long-standing American manufacturer of powersports vehicles, established in 1954, known for its pioneering spirit in snowmobiles.
Rmk Lineage:
The RMK (Ridgeline Mountain King) line has been Polaris's flagship for deep snow riding for decades, continually evolving with longer tracks, higher lug heights, and rider-forward chassis designs.
Manufacturing Location:
Typically manufactured in Roseau, Minnesota, USA (Polaris's primary snowmobile facility)
Industry Accolades:
Polaris RMK models have historically received numerous awards and high marks from snowmobile publications for their deep snow capability and performance.
Performance Reviews:
Consistently ranked highly for mountain climbing, powder handling, and chassis dynamics by leading snowmobile magazines (e.g., SnowGoer, Dirt Wheels).
