Engine:
Full coverage including disassembly, assembly, tuning, and component diagnosis.
Fuel System:
Carburetor service, fuel pump, fuel lines, and tank.
Lubrication Cooling:
Engine oil system, oil pump, and cooling system (if applicable).
Combustion System:
Ignition system, spark plugs, CDI unit, and timing.
Transmission:
Gearbox service, clutch operation, and drive chain maintenance.
Front Wheel Steering:
Front suspension, steering components, wheel bearings, and hub assembly.
Rear Wheel:
Rear suspension, swingarm, axle, wheel bearings, and hub assembly.
Fenders Exhaust:
Body panels, fender removal/installation, and exhaust system maintenance.
Electrical System:
Wiring diagrams, lighting, battery, ignition, charging system, and troubleshooting electrical faults.
Troubleshooting:
Diagnostic procedures for common issues and systematic fault finding.
Maintenance:
Routine checks, lubrication, filter changes, and general upkeep.
Repair:
Detailed step-by-step instructions for component repairs and replacements.
Engine Rebuild:
Complete engine overhaul procedures, including piston, cylinder, and crankshaft service.
Transmission Overhaul:
Gearbox disassembly, inspection, and reassembly instructions.
Suspension Service:
Front and rear suspension component maintenance and adjustments.
Brake System Maintenance:
Brake pad replacement, caliper service, and fluid bleeding.
Electrical Troubleshooting:
Diagnosis of starting, charging, and ignition system issues.
Carburetor Adjustment:
Detailed instructions for tuning and synchronizing carburetors.
Engine Performance Tuning:
Information pertinent to optimizing engine output.
Depth:
Factory-level, suitable for professional technicians and advanced DIY mechanics.
Diagnostic Capabilities:
Advanced diagnostic trees and troubleshooting flowcharts.
Rebuild Instructions:
Detailed, step-by-step instructions for complete component rebuilds.
Engine Type:
Two-stroke, Liquid-cooled, Reed Valve, V-Twin
Displacement:
347cc (347 cm³)
Bore X Stroke:
64.0 mm x 54.0 mm
Compression Ratio:
7.1:1 (nominal)
Carburetion:
Dual Mikuni VM26SS carburetors
Ignition:
CDI (Capacitor Discharge Ignition)
Starting System:
Electric
Estimated Horsepower:
Approx. 44 hp @ 7,500 rpm (stock)
Estimated Torque:
Approx. 32 ft-lbs @ 6,000 rpm (stock)
Fuel Type:
Unleaded gasoline, 91 octane or higher recommended
Fuel Mixture Ratio:
50:1 (pre-mix with high-quality 2-stroke oil)
Fuel Tank Capacity:
3.7 gallons (14 liters)
Safety Ratings:
ATV safety is rider dependent; refer to owner's manual for safe operation guidelines.
Brakes:
Front: Dual Hydraulic Disc; Rear: Single Hydraulic Disc
Throttle Limiter:
Thumb throttle with safety stop functionality.
Handlebars:
Grip design and handlebar shape for rider control.
Footwells:
Wide, serrated footwells for secure footing.
Oil Change Interval:
Refer to manual for specific hours/mileage; typically after initial break-in and then periodically based on usage.
Air Filter Cleaning:
Frequent inspection and cleaning/replacement recommended, especially in dusty conditions.
Spark Plug Replacement:
As needed based on inspection; refer to manual for type and gap.
Chain Lubrication Adjustment:
Regular lubrication and tension adjustment recommended.
Engine Oil Type:
Yamaha recommended 2-stroke synthetic oil (e.g., Yamalube 2M) mixed at 50:1 ratio in fuel.
Transmission Oil Type:
Yamaha recommended gear oil (e.g., Yamalube 4-stroke 10W-40 or equivalent SAE 80 API GL-4 gear oil).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Coolant Type:
Permanent type antifreeze coolant (ethylene glycol based), 50/50 mix with distilled water.
Known Issues:
Common issues can include carburetor jetting for altitude/modifications, clutch wear, suspension linkage wear, and reed valve issues. This manual addresses these thoroughly.