Positioning:
The YFM Wolverine 350 was a popular utility ATV known for its reliability and capability in varied terrain, positioned as a versatile recreational and light-duty work vehicle.
Competitors 1998:
Competed with models from Honda (e.g., FourTrax 300/350), Suzuki (e.g., QuadRunner 300), and Kawasaki (e.g., Bayou 300).
Features:
Durable shaft drive, comfortable seating, reliable air-cooled engine, capable suspension for its class.
Primary Coverage:
Comprehensive service and repair procedures for the 1998 Yamaha YFM Wolverine 350 ATV.
Secondary Coverage:
Maintenance schedules, troubleshooting, specifications, and general information.
Estimated Pages:
Information not explicitly provided, but typical for a factory service manual of this era.
Type:
Factory Service Repair Manual
Compatibility:
Windows and MAC
Requirements:
Adobe PDF Reader
Engine:
Complete engine overhaul, disassembly, inspection, assembly, valve adjustment, piston/cylinder, crankshaft, camshaft, timing.
Carburetion:
Carburetor identification, disassembly, cleaning, adjustment, jetting, troubleshooting.
Electrical:
Wiring diagrams, ignition system, starting system, charging system, lighting, electrical component testing and troubleshooting.
Chassis:
Frame, suspension (front and rear), steering system, brakes (front and rear), wheels, tires, drive system (shaft drive).
Maintenance:
Periodic inspection and adjustment, lubrication, filter changes, fluid level checks, valve clearance adjustments.
Repair:
Detailed step-by-step repair instructions for all major components and systems.
Troubleshooting:
Diagnostic flowcharts and symptom-based troubleshooting for common problems.
Depth:
Factory-level diagnostic and repair procedures, suitable for both professional technicians and experienced DIY enthusiasts.
Type:
Four-stroke, SOHC, air-cooled
Bore X Stroke:
83.0 mm x 64.5 mm (Typical for this engine family)
Compression Ratio:
9.7:1 (Typical for this engine family)
Horsepower:
Approximately 20-22 HP (Estimated, specific figures may vary slightly)
Torque:
Not explicitly stated in product info, but typically around 20-22 lb-ft.
Fuel Delivery:
Carburetor
Carburetor Model:
Mikuni VM34-type (Typical)
Oil Type:
Yamalube 4 (or equivalent 4-stroke motorcycle oil)
Oil Capacity:
Approximately 1.7 Liters (with filter change, refer to manual for exact spec)
Length:
Approximately 1900 mm (74.8 in)
Width:
Approximately 1070 mm (42.1 in)
Height:
Approximately 1110 mm (43.7 in)
Dry Weight:
Approximately 230 kg (507 lbs)
Fuel Capacity:
Approximately 10.0 Liters (2.6 US gal)
Oil Change:
Every 1000 km (600 miles) or 6 months, whichever comes first (Refer to manual for precise interval).
Air Filter Cleaning:
Every 500 km (300 miles) or as needed based on operating conditions.
Spark Plug Replacement:
Every 2000 km (1200 miles) or as needed.
Valve Adjustment:
Every 2000 km (1200 miles) or as needed.
Engine Oil:
Yamalube 4 (or equivalent API SG, SAE 10W-40 or 20W-40)
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid.
Final Drive Oil:
Yamalube Gear Oil (or equivalent SAE 80 hypoid gear oil)
Common Wear Items:
Carburetor jets can clog over time, requiring cleaning. Drive shaft U-joints may require periodic lubrication and eventual replacement. Brake components will require routine inspection and replacement.
Troubleshooting Tips:
The manual's troubleshooting section is invaluable for diagnosing starting issues, poor running conditions, and driveability problems.
Heritage:
Yamaha has a long-standing reputation for producing reliable and high-performance motorcycles and ATVs since the mid-20th century.
Evolution:
The Wolverine line evolved from earlier Yamaha utility ATVs, emphasizing a balance of trail capability and user-friendliness. The 1998 model represents a refinement of this formula.
Manufacturing Location:
Typically manufactured in Japan or North America for Yamaha.
