Vehicle Segment:
High-performance sport ATV
Target Audience:
Enthusiasts and owners seeking in-depth repair and maintenance knowledge
Key Competitors At Time:
Suzuki LT250R, Honda TRX250R, Kawasaki Tecate-4
Manual Advantage:
Vehicle/model specific, technician-level detail, comprehensive A-Z coverage
Diy Benefit:
Enables self-sufficiency for repairs and maintenance, saving costs
Engine Mechanical:
Complete overhaul, cylinder head, piston, crankshaft, bearings, seals, cooling system (liquid-cooled)
Engine Fuel System:
Carburetor tuning and rebuild (dual Mikuni VM34), fuel pump, fuel lines, fuel tank
Engine Ignition System:
CDI ignition system, spark plugs, coils, wiring
Transmission Drivetrain:
Clutch system (wet multi-plate), gearbox, final drive, chain and sprockets
Chassis Suspension:
Front suspension (double A-arm, adjustable shocks), rear suspension (swingarm, adjustable shock), steering system
Brakes:
Front and rear hydraulic disc brakes, master cylinders, calipers, brake lines
Electrical System:
Wiring schematics, lighting, battery, starter, kill switch, indicators
Bodywork Frame:
Frame inspection and repair, body panels, seat, handlebars, footpegs
Maintenance:
Routine checks, lubrication, filter replacement, chain adjustment, brake bleeding
Diagnostics:
Troubleshooting guides for common problems, component testing
Repair:
Step-by-step instructions for all major component repairs and replacements
Rebuilds:
Complete engine and gearbox rebuild procedures
Installation:
Instructions for component installation and adjustment
Depth:
Factory highly detailed, technician-level, comprehensive
Compatibility:
Windows (7, Vista 32/64, XP, ME, 98, NT, 2000), Mac
Requirements:
Adobe PDF Reader
Features:
All pages printable, zoomable images for enlarged copies
Delivery Method:
Instant Download
Digital Format Details:
High-resolution PDF, vector-based diagrams and schematics where applicable
Engine Type:
2-Stroke, Liquid-Cooled, Reed Valve, V-Twin
Displacement:
347cc (347 cm³)
Bore X Stroke:
64.0 mm x 54.0 mm (typical)
Compression Ratio:
7.2:1 (typical, check specific model year)
Fuel Delivery:
Dual Mikuni VM34 carburetors
Horsepower:
Approximately 50-55 hp (stock, varies by year and tuning)
Torque:
Not typically published in standard format, but significant for its class
Fuel Type:
Unleaded gasoline (91 octane or higher recommended), 2-stroke oil pre-mix
Oil Mixture Ratio:
100:1 (Yamalube 2R recommended, check manual for exact specification)
Atv Safety Considerations:
High-performance machine requiring experienced rider, use of safety gear essential
Braking System:
Hydraulic disc brakes front and rear for strong stopping power
Handlebar Design:
Wide handlebars for control, often with a crossbar for reinforcement
Oil Change Interval:
Specific intervals for gearbox oil (refer to manual), regular spark plug inspection and cleaning/replacement
Chain Adjustment Interval:
Check and adjust chain slack every 500-1000 km or as needed based on riding conditions
Gearbox Oil:
Yamaha recommended 10W-30 API SE or SF (specific viscosity and API rating in manual)
Coolant:
Permanent type anti-freeze, 50% mixture with distilled water (specific capacity in manual)
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid
Carburetor Tuning:
Can be sensitive to altitude and temperature, requiring periodic jetting adjustments
Engine Wear:
High-performance 2-stroke engines require diligent maintenance, especially top-end rebuilds (pistons, rings) at higher mileage intervals
Electrical Connections:
Corrosion on connectors can cause intermittent electrical issues
Suspension Wear:
Bushings and seals in suspension can wear over time, affecting handling
Manufacturer:
Yamaha Motor Company, renowned for performance and innovation in powersports
Key Innovations:
V-twin 2-stroke engine, liquid cooling, powerful performance for its era
Production Period:
1987-2006 (with updates and variations)