Market Segment:
Performance Trail Snowmobile
Target Audience:
Enthusiasts seeking a reliable and capable snowmobile for trail riding and general recreational use.
Competitors:
Arctic Cat (e.g., F-series), Ski-Doo (e.g., MXZ series), Yamaha (e.g., Phazer series).
Engine Type:
Turbocharged 4-stroke twin-cylinder engine, known for its power and smooth delivery.
Chassis Platform:
Often built on Polaris's Liberty chassis or similar platforms, emphasizing comfort and handling.
Engine:
Complete engine repair, overhaul, diagnostics, and adjustments for the Polaris FST engine.
Fuel System:
Fuel injection system, fuel pump, injectors, fuel lines, and filters.
Ignition System:
Ignition coils, spark plugs, wiring, and diagnostic procedures.
Cooling System:
Radiator, coolant, water pump, hoses, and thermostat.
Drive System:
Clutching (primary and secondary), drive belt, chaincase, and gearbox maintenance and repair.
Suspension:
Front and rear suspension components, shocks, springs, bushings, and alignment.
Steering:
Steering column, tie rods, skis, and linkage adjustments and repair.
Brakes:
Brake system components, calipers, master cylinder, brake lines, and fluid changes.
Electrical System:
Wiring diagrams, starter, alternator, battery, lighting, and accessory circuits.
Chassis And Body:
Frame, body panels, seat, track, and tunnel repair and maintenance.
Maintenance:
Regular scheduled maintenance, lubrication points, and inspection procedures.
Troubleshooting:
Diagnostic charts and procedures for identifying and resolving common mechanical and electrical issues.
Repair:
Step-by-step repair instructions for all major vehicle components and systems.
Overhaul:
Detailed procedures for engine, transmission, and clutch overhauls.
Adjustments:
Settings and adjustments for engine, clutches, brakes, and suspension.
Specifications:
Torque specifications, clearances, fluid capacities, and electrical values.
Depth:
Comprehensive, suitable for professional technicians and advanced DIY mechanics. Covers basic maintenance to complete engine rebuilds and advanced diagnostics.
Engine Family:
Polaris FST
Engine Configuration:
Inline 2-cylinder, 4-stroke, liquid-cooled
Displacement:
Typically 750cc (exact for FST variant may vary slightly; often quoted around 750cc or 755cc).
Bore X Stroke:
Approx. 84.6 mm x 68 mm (typical for this engine family).
Compression Ratio:
Approx. 8.5:1 (typical for turbocharged applications).
Horsepower:
Ranges from approximately 120-140 HP depending on specific tuning and model year.
Torque:
Strong low-end and mid-range torque delivery due to turbocharging.
Fuel Delivery:
Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded gasoline (87 octane or higher recommended, check manual for specific minimum).
Ignition Type:
Digital CDI with electronic advance.
Oil Type:
Synthetic 0W-40 or 5W-40 snowmobile specific oil recommended (refer to manual for exact Polaris specifications).
Transmission Type:
CVT (Continuously Variable Transmission) with Polaris P-85 Primary and P-90 Secondary clutches.
Optional Transmission:
N/A (CVT is standard)
Clutch Engagement:
Designed for smooth engagement and optimal power transfer across varying speeds and loads.
Gear Reduction:
Integrated into the drive system for efficient power delivery to the track.
Clutch Sheave Lube:
Specific grease recommended for clutch components; consult manual for part numbers and type.
Overall Length:
Varies by specific FS FST model, typically around 116-120 inches.
Overall Width:
Varies, generally around 48 inches.
Track Width:
Varies, often around 15 inches wide.
Track Length:
Typically 121 inches.
Dry Weight:
Approx. 480-500 lbs (dry, unladen).
Safety Standards:
Compliant with applicable ANSI and industry safety standards for snowmobiles of its era.
Braking System:
Hydraulic disc brake with caliper and braided stainless steel lines for reliable stopping power.
Throttle Safety:
Thumb throttle with safety lever and engine kill switch.
Lighting:
Halogen headlights, taillight, and brake light for visibility.
Operator Station:
Ergonomic seating position, protective windshield.
Instrument Cluster:
Digital/analog combination instrument cluster displaying speed, RPM, fuel level, engine temp, and diagnostic codes.
Engine Management:
Advanced electronic engine control unit (ECU) managing fuel injection, ignition timing, and turbocharger boost.
Accessories:
Provision for accessories like heated grips, hand warmers, and possibly power outlets for charging devices.
Oil Change Interval:
Typically every 2,000-3,000 miles or annually, whichever comes first (consult manual for precise interval and break-in service).
Spark Plug Replacement:
Recommended at major service intervals or based on inspection (refer to manual for specific spark plug type and gap).
Clutch Inspection:
Regular inspection of drive and driven clutches for wear, alignment, and belt condition is crucial for performance and longevity.
Track Tension:
Regular adjustment of track tension to specified slack is essential for proper performance and to prevent damage.
Coolant Type:
Antifreeze/coolant mixture (e.g., ethylene glycol based) suitable for cold weather operation. Refer to manual for specific Polaris coolant or compatible types.
Brake Fluid Type:
DOT 4 hydraulic brake fluid (check manual for confirmation).
Chaincase Oil:
Specific gear oil for the chaincase; consult manual for viscosity and capacity.
Turbocharger Care:
Proper warm-up and cool-down procedures are vital for turbocharger longevity. Avoid prolonged idling at high temperatures. Turbo lag can be a characteristic.
Clutch Wear:
Clutch belts and rollers are wear items and require periodic inspection and replacement. Clutch alignment is critical.
Intercooler Maintenance:
Ensure the intercooler is free from debris and leaks for optimal engine performance, especially in dusty or wet conditions.
Brand Overview:
Polaris is a well-established American manufacturer of powersports vehicles, including snowmobiles, ATVs, and motorcycles, with a long history of innovation and performance.
Fs Fst Lineage:
The FS FST model was part of Polaris's lineup of 4-stroke, turbocharged snowmobiles, representing a move towards more powerful and fuel-efficient engines in the trail performance segment.
Production Years Covered:
2006, 2007, 2008
Manufacturing Location:
Primarily manufactured by Polaris Industries in the United States.
