Market Segment:
Light-duty, utility-oriented snowmobile.
Target Audience:
Trail riders, utility users, and those seeking reliable and manageable snowmobiling.
Key Competitors:
Ski-Doo Citation 250, Arctic Cat Panther 270.
Design Philosophy:
Simplicity, reliability, and ease of operation.
Notable Features:
Lightweight construction, fuel-efficient engine, comfortable seating for one.
Engine:
Complete engine disassembly, assembly, tuning, and troubleshooting for the 249cc two-stroke engine.
Fuel System:
Carburetor service, fuel line inspection, fuel pump troubleshooting.
Ignition System:
CDI unit testing, spark plug specifications, ignition timing adjustment.
Lubrication System:
Oil injection system maintenance, oil pump calibration, pre-mix ratio recommendations.
Cooling System:
Air cooling system maintenance, fan belt inspection and tensioning.
Drive System:
Clutch assembly inspection and adjustment (primary and secondary), drive belt inspection and replacement.
Suspension:
Front and rear suspension component inspection, shock absorber service, track and skid frame maintenance.
Brakes:
Brake caliper service, brake pad inspection and replacement, brake fluid level checks.
Electrical System:
Wiring diagrams, lighting system maintenance, battery testing and charging.
Chassis And Body:
Frame inspection, body panel removal and installation, seat maintenance.
Maintenance:
Regular scheduled maintenance procedures, cleaning, lubrication, and inspection points.
Troubleshooting:
Diagnostic flowcharts and common problem identification for engine, electrical, and mechanical issues.
Repair:
Step-by-step instructions for component repair and replacement, including engine rebuilds.
Adjustment:
Carburetor jetting, throttle cable adjustment, brake linkage tuning.
Disassembly Assembly:
Detailed procedures for taking apart and reassembling all major components.
Depth:
Comprehensive coverage from basic rider maintenance to full engine and drivetrain overhauls.
Diagnostics:
Detailed diagnostic procedures for identifying and resolving performance issues and system failures.
Specifications:
Includes all necessary torque values, clearances, fluid capacities, and electrical specifications.
Engine Type:
Two-stroke, single-cylinder
Displacement:
249 cc (15.2 cu. in.)
Bore X Stroke:
73.0 mm x 59.0 mm (2.87 in. x 2.32 in.)
Cooling Method:
Air-cooled
Recommended Fuel:
Unleaded gasoline, 87 octane
Recommended Oil:
Yamalube 2-stroke oil or equivalent API TC, JASO FD certified.
Horsepower:
Approximately 20-22 hp (specifications may vary slightly by year/tuning)
Torque:
Approximate peak torque around 17-19 ft-lbs
Carburetor Model:
Mikuni VM32SS (or similar variant)
Carburetor Jets:
Specific jet sizes (main, pilot, needle) detailed in manual.
Ignition Type:
CDI (Capacitor Discharge Ignition)
Spark Plug Type:
NGK BR9ES (or equivalent)
Oil Capacity:
Oil injection tank capacity: 2.0 Liters (2.1 US qt.)
Transmission Type:
Automatic CVT (Continuously Variable Transmission)
Clutch System:
Yamaha Dual-V Clutch System (CVT)
Drive Belt Size:
Specific dimensions provided in manual, varies by year and model revision.
Gear Reduction:
Chain drive reduction gear system.
Overall Length:
Approximately 2,570 mm (101.2 in.)
Overall Width:
Approximately 1,040 mm (40.9 in.)
Overall Height:
Approximately 1,100 mm (43.3 in.)
Dry Weight:
Approximately 192 kg (423 lbs)
Fuel Tank Capacity:
5.0 Liters (5.3 US qt.)
Safety Focus:
Emphasis on stability and controlled operation in varied snow conditions.
Braking System:
Hydraulic disc brake, rear track brake.
Handlebars:
Grip warmers, padded handlebar crossbar.
Lighting:
Headlight, taillight/stoplight.
Initial Service:
First 20 hours or 1 month (check manual for specifics).
Regular Checks:
Daily checks: track tension, oil level, coolant level (if applicable), lights, controls. Monthly/50-hour checks: air filter, spark plugs, drive belt.
Annual Service:
Carburetor cleaning, fuel filter replacement, general inspection.
Engine Oil Mix Ratio:
50:1 (pre-mix) or use oil injection system with Yamalube 2.
Brake Fluid:
DOT 3 or DOT 4 (refer to manual for specific recommendation).
Common Problems:
Carburetor gumming due to stale fuel, drive belt wear, recoil starter issues, track tension adjustment.
Preventative Maintenance:
Regular fuel stabilization, proper storage, diligent cleaning, and periodic drive belt replacement are crucial.
Manufacturer:
Yamaha Motor Company, renowned for its precision engineering across motorcycles, marine, and powersports.
Development Goal:
To provide a reliable, lightweight, and easy-to-handle snowmobile for recreational and utility use.
Production Period:
1982-1989
Manufacturing Location:
Japan
