Category:
Entry-level to mid-range sport/utility ATV.
Target Audience:
Recreational riders, hunters, farmers, and utility users seeking a reliable and capable all-terrain vehicle.
Key Competitors 1999:
Honda FourTrax 300/350, Suzuki QuadRunner 300/350, Kawasaki Bayou 300/300.
Differentiating Factors:
Known for its ruggedness, reliability, and a good balance of power and maneuverability. Often praised for its simple, durable design.
Utility Focus:
Designed for versatility, capable in various terrains including mud, sand, and trails.
Systems Covered:
Engine, Drivetrain, Transmission, Chassis, Suspension, Steering, Brakes, Electrical System, Fuel System, Cooling System, Lubrication System, Bodywork, Troubleshooting, Specifications
Estimated Pages:
Refer to specific listing, typically 200-400 pages for factory service manuals
Type:
Factory Service Repair Manual
Engine:
Comprehensive coverage including disassembly, assembly, component inspection, clearances, torque specifications, and diagnostics for the 348cc air-cooled engine.
Drivetrain:
Detailed information on the chain drive system, rear differential, and associated components, including lubrication and adjustment.
Transmission:
Coverage of the 5-speed manual transmission with reverse, including clutch operation, gear shift mechanism, and internal component servicing.
Chassis Suspension:
Front and rear suspension systems, including shock absorbers, springs, swingarms, and ball joints, with adjustment and replacement procedures.
Steering:
Steering column, tie rods, and steering knuckles, with alignment procedures and troubleshooting for play or stiffness.
Brakes:
Front and rear drum brake systems, including inspection, adjustment, replacement of brake shoes, and hydraulic system bleeding if applicable (though typically drum).
Electrical System:
Complete electrical schematics, ignition system, lighting, starter system, battery maintenance, and troubleshooting of electrical faults.
Fuel System:
Carburetor (likely Mikuni VM series), fuel tank, fuel lines, and petcock, including disassembly, cleaning, adjustment, and rebuilding.
Cooling System:
Air-cooled engine, focus on fin cleaning and airflow management.
Lubrication System:
Engine oil specifications, change intervals, and lubrication points for the drivetrain and chassis.
Bodywork:
Removal and installation of body panels, fenders, and seats.
Maintenance:
Regular servicing, oil changes, filter replacements, chain lubrication and adjustment, brake adjustments, spark plug service, air filter cleaning/replacement, and pre-ride inspections.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon problems, fault codes (if applicable), and guided troubleshooting trees.
Repair:
Step-by-step instructions for component disassembly, inspection, repair, reassembly, and replacement across all major vehicle systems.
Rebuild:
Detailed instructions for complete engine rebuilds, transmission overhauls, and suspension component rebuilding.
Installation:
Procedures for installing genuine Yamaha parts and common aftermarket accessories.
Depth:
Comprehensive factory-level detail suitable for professional mechanics and experienced DIY enthusiasts, covering everything from basic adjustments to full engine and transmission rebuilds.
Engine Type:
SOHC (Single Overhead Cam), 4-stroke, Air-cooled
Bore X Stroke:
80.0 mm x 69.5 mm
Horsepower Estimate:
Approximately 20-22 hp @ 6500 rpm (actual factory figures may vary and are often not published)
Torque Estimate:
Approximately 20-22 lb-ft @ 5000 rpm
Carburetor:
Mikuni VM series (likely VM34 or similar) with accelerator pump
Fuel Type:
Unleaded gasoline, minimum 87 octane
Fuel Tank Capacity:
3.2 US gallons (12.1 liters)
Oil Capacity With Filter:
Approx. 2.4 US quarts (2.3 liters)
Recommended Oil Type:
Yamalube 4 (or equivalent) SAE 10W-30 API SG or higher
Transmission Type:
5-speed manual with Reverse
Clutch Type:
Wet, multi-plate
Final Drive:
Chain Drive, sealed O-ring type
Gear Ratios:
Specific ratios detailed in manual for each gear and reverse.
Transmission Oil Type:
Yamalube 4 (or equivalent) SAE 10W-30 API SG or higher (same as engine oil)
Transmission Oil Capacity:
Approx. 0.8 US quarts (0.75 liters)
Atv Safety Considerations:
All ATVs require protective gear (helmet, goggles, boots, gloves, long sleeves/pants). Operation should be limited to suitable terrain and riders trained in ATV safety.
Braking System:
Front and rear drum brakes operated by handlebar levers.
Handlebars:
Standard ATV handlebars with comfortable grips and lever placement.
Lighting:
Dual front headlights, taillight/stoplight.
Engine Oil Change:
Every 1000 km (600 miles) or 6 months, whichever comes first.
Air Filter Cleaning:
Every 3 months or as needed based on operating conditions (e.g., dusty environments).
Spark Plug Inspection:
Every 6 months or 1000 km (600 miles).
Chain Lubrication Adjustment:
Every 500 km (300 miles) or more frequently in wet or dirty conditions.
Valve Clearance Check:
Every 12 months or 2000 km (1200 miles).
Engine Oil:
Yamalube 4 (or equivalent) SAE 10W-30 API SG or higher.
Transmission Oil:
Yamalube 4 (or equivalent) SAE 10W-30 API SG or higher.
Brake Fluid:
DOT 3 or DOT 4 brake fluid (check specific lever reservoirs, if any; typically drum brakes require minimal fluid).
Common Wear Items:
Brake shoes, tires, wheel bearings, steering components, drive chain and sprockets, and carburetor diaphragms can be common wear items requiring periodic inspection and replacement.
Carburetor Performance:
The accelerator pump in the carburetor can sometimes require adjustment or cleaning for optimal performance, especially after long periods of storage.
Carburetor Idle:
Maintaining a stable idle speed is crucial; this often relates to air-fuel mixture adjustments and cleanliness of the idle circuit.
Yamaha Atv Legacy:
Yamaha has a long and respected history in ATV manufacturing, pioneering many innovations and consistently producing reliable, high-performance machines since the late 1970s.
Wolverine Lineage:
The Wolverine series has evolved through various engine sizes and configurations, with the 350cc air-cooled model being a popular and enduring iteration known for its workhorse capabilities.
Production Period:
The YFM350 Wolverine was produced for many years, with the 1999 model representing a refined version of the established platform.
