Segment:
Mountain/Backcountry Snowmobile
Target User:
Riders seeking deep snow performance, agility in challenging terrain, and the capability for climbing and technical riding.
Competitors:
Arctic Cat M Series, Ski-Doo Summit, Yamaha Nytro M-TX.
Key Differentiators:
Polaris's Liberty engine platform known for reliable power delivery, innovative chassis design for its era, and strong emphasis on rider-forward ergonomics for improved control in deep snow.
Features:
Lightweight chassis, aggressive track design (155-inch length), powerful 700cc Liberty twin engine, Pro-Ride or similar rear suspension for deep snow capability, rider-centric ergonomics.
Systems Covered:
Engine, Fuel System, Ignition System, Cooling System, Drive System (Clutching & Belt), Suspension (Front & Rear), Steering, Brakes, Electrical System, Chassis, Body Panels, Decals.
Procedures Covered:
Routine Maintenance, Troubleshooting, Diagnostics, Component Removal & Installation, Repair Procedures, Adjustments, Specifications, Electrical Schematics, Torque Specifications.
Type:
Factory Service Repair Manual
Engine:
Detailed coverage of the 700cc Liberty Twin engine, including top-end (cylinder heads, pistons, rings), bottom-end (crankshaft, connecting rods, bearings), lubrication system, cooling system, and exhaust system.
Fuel System:
Carburetor (Mikuni VM Series or similar) tuning, cleaning, and rebuilding; fuel pump operation and testing; fuel line routing and maintenance.
Drive System:
Primary (Drive) clutch service, secondary (Driven) clutch service, belt inspection and replacement, chaincase lubrication and inspection, gear ratios, and drive sprocket/track maintenance.
Suspension:
Front A-arm suspension geometry, shock absorber overhaul and adjustment, skis, and steering post components. Rear suspension (e.g., Pro-Ride or similar platform) linkage, shock absorbers, torsion springs, and track drive components.
Electrical System:
Complete wiring diagrams, charging system (stator, voltage regulator), ignition system (CDI, ignition coils), lighting, starter system, and accessory circuits.
Maintenance:
Regular service intervals for oil changes, spark plug replacement, belt inspection, chaincase lubrication, suspension checks, and brake system servicing.
Troubleshooting:
Systematic diagnostic flowcharts for common issues such as starting problems, poor performance, overheating, electrical faults, and clutch slippage.
Repair:
Detailed step-by-step instructions for rebuilding engine components, repairing the transmission, servicing suspension and steering, and performing electrical system repairs.
Technical Specifications:
Precise torque values for fasteners, engine compression specifications, carburetor jetting recommendations, suspension alignment data, and electrical system resistance/voltage readings.
Depth:
Comprehensive, covering from basic owner maintenance to complete engine rebuilds and advanced electrical diagnostics. Suitable for both DIY enthusiasts and professional technicians.
Engine Type:
2-stroke, liquid-cooled, parallel-twin
Displacement:
698cc (approx.)
Bore X Stroke:
Refer to manual for exact specifications
Ignition:
CDI (Capacitor Discharge Ignition)
Lubrication:
Autolube (Oil Injection)
Horsepower:
Approx. 130-140 HP (Estimate based on era and displacement)
Torque:
Refer to manual for specific torque curves
Carburetion:
Dual Mikuni VM Series Carburetors (e.g., VM38 or VM40) - Specific sizes and jetting detailed in manual.
Fuel Type:
Unleaded gasoline, 87-91 octane recommended
Fuel Capacity:
Refer to manual (typically 10-12 gallons)
Type:
CVT (Continuously Variable Transmission) with Polaris P-85 Drive Clutch and Adaptable Driven Clutch (e.g., P-90X or similar).
Drive Belt:
Specific belt number (e.g., 3211048, 3211077, etc.) and replacement guidelines in manual.
Gear Reduction:
Chaincase with fixed gear reduction ratios; specifications detailed in manual.
Clutch Calibration:
Manual covers clutch weight adjustments, spring options, and helix profiles for optimal performance based on snow conditions and rider preference.
Chaincase Fluid:
Specific chaincase oil type and viscosity; capacity and change intervals specified in manual (e.g., Polaris Demand Drive Fluid or equivalent).
Crash Test Results:
Snowmobiles are not typically rated by traditional automotive safety organizations (NHTSA/IIHS). Safety is primarily related to design, handling, and operator responsibility.
Braking System:
Hydraulic disc brake system, with specifications for fluid type (DOT 4 recommended) and bleeding procedures in the manual.
Throttle Control:
Thumb throttle with adjustment and safety interlock features covered in the manual.
Kill Switch:
Emergency engine shut-off switch with tether; operation and testing covered.
Lighting:
Headlights, taillight/brake light; electrical schematics for troubleshooting.
Display System:
Basic LCD instrument cluster displaying speed, RPM, odometer, trip meter, fuel level, and warning lights. Details on gauge functions in manual.
Features:
No advanced driver-assistance systems (ADAS) in the modern automotive sense. Focus is on mechanical control and rider feedback.
Features:
N/A. Primarily a mechanical system.
Oil Change:
Every 50-100 hours or annually; refer to manual for precise interval.
Spark Plug Replacement:
Refer to manual; typically based on hours or mileage, or when fouled.
Chaincase Fluid Change:
Refer to manual; often annually or every 2,000 miles.
Clutch Belt Inspection:
Frequent inspection for wear, damage, and proper tension, especially before critical rides.
Engine Oil:
Polaris 2-stroke Synthetic Oil (or equivalent meeting API TC, JASO FD/FD+ specifications).
Coolant:
Ethylene glycol-based antifreeze, 50/50 mixture with distilled water; specific type and capacity in manual.
Brake Fluid:
DOT 4 hydraulic brake fluid recommended.
Chaincase Fluid:
Polaris Demand Drive Fluid or equivalent specified viscosity and type.
Common Issues:
Clutch alignment and belt wear; potential for intake boot cracks affecting air-fuel mixture; occasional electrical connector corrosion; shock absorber seal leaks with high mileage.
Preventative Maintenance:
Regular cleaning of clutches, checking for belt condition, inspecting intake system, ensuring proper cooling system maintenance, and lubricating suspension points are crucial for longevity.
Heritage:
Polaris Industries Inc., founded in 1954, is a leading manufacturer of powersports vehicles, including snowmobiles, ATVs, UTVs, and motorcycles. Known for innovation and off-road performance.
Rmk Lineage:
The RMK (Rocky Mountain King) line has a long history of dominance in the mountain riding segment, evolving with chassis improvements, engine advancements, and suspension technology to cater to deep snow and vertical performance.
2008 Model Context:
The 2008 RMK 700 155 represented Polaris's commitment to the mountain segment, likely building upon the successful chassis and Liberty engine platform introduced in prior years, with refinements in suspension and ergonomics.
Manufacturing Location:
Polaris vehicles are primarily manufactured in the United States (e.g., Roseau, Minnesota; Spirit Lake, Iowa).
Award History:
While specific awards for the 2008 RMK 700 155 may not be readily available, Polaris snowmobiles, particularly the RMK line, have consistently received accolades from industry publications and riders for their deep snow performance and innovation.
Industry Perception:
Generally regarded as a capable and reliable mountain snowmobile for its generation, favored by riders who value its power and handling characteristics in soft snow conditions.
