Atv Segment:
Sport ATV, known for its performance and handling in its era.
Key Competitors:
Honda TRX300EX/400EX, Suzuki LT-Z250/400, Kawasaki Mojave 250.
Performance Focus:
The YFM350X Warrior was designed for sport riding, offering a good balance of power, agility, and suspension travel for its time.
Reliability:
Yamaha's reputation for robust and reliable engines is reflected in the YFM350X.
Manual Value:
Essential for owners and technicians to maintain, diagnose, and repair the YFM350X efficiently, ensuring longevity and optimal performance.
Model Years Covered:
1997, 1998, 1999, 2000, 2001, 2002
Engine Variants Covered:
348cc Air-Cooled SOHC 4-Stroke Single Cylinder
Estimated Page Count:
300-500 pages (typical for comprehensive service manuals)
Manual Type:
Workshop Service Manual / Repair Manual
Engine Systems:
Engine assembly, disassembly, inspection, tuning, carburetor, cooling system, lubrication system, valve train, piston, crankshaft, cylinder head, cylinder block.
Drivetrain Systems:
Clutch (automatic centrifugal), transmission (5-speed with reverse), final drive, drive shafts, differential (if applicable, though typically solid rear axle).
Chassis Systems:
Frame inspection and repair, suspension (front and rear), steering system, wheels, tires.
Braking Systems:
Front and rear brake systems (hydraulic disc brakes), brake caliper service, brake fluid replacement, master cylinder.
Electrical Systems:
Ignition system, charging system (stator, rectifier/regulator), lighting, battery, starter motor, wiring diagrams, switches, fuses.
Fuel System:
Fuel tank, fuel lines, fuel filter, carburetor (Mikuni VM32SS or similar), fuel pump (if applicable).
Exhaust System:
Exhaust pipe, muffler, gaskets.
Body And Trim:
Fenders, plastic body panels, seat, handlebars, controls.
Maintenance Procedures:
Oil change, filter replacement, air filter cleaning/replacement, spark plug replacement, chain adjustment, brake bleeding, valve clearance adjustment.
Repair Procedures:
Engine overhaul, transmission rebuild, carburetor overhaul, suspension component replacement, brake system repair, electrical component testing and replacement.
Troubleshooting Guides:
Diagnostic charts, common problems and solutions, symptom-based troubleshooting.
Technical Specifications:
Torque specifications, clearances, measurements, wiring schematics, diagnostic codes (if applicable).
Depth Of Coverage:
Comprehensive, covering from routine maintenance to complete engine and transmission overhauls, including detailed diagnostic procedures and specifications.
Engine Type:
4-stroke, SOHC, air-cooled
Displacement:
348 cc (21.2 cu in)
Bore X Stroke:
81 mm x 68 mm (approximate)
Compression Ratio:
9.7:1 (typical)
Valve Configuration:
SOHC, 2 valves
Horsepower:
Approximately 20-22 HP at 6,500 RPM (estimated, subject to variation)
Torque:
Approximately 21-23 lb-ft at 5,000 RPM (estimated, subject to variation)
Carburetor Model:
Mikuni VM32SS (or similar specification)
Fuel Type:
Unleaded gasoline, minimum octane rating 87
Fuel Tank Capacity:
2.6 US gal (9.8 L)
Cooling Method:
Air-cooled
Oil Type:
Yamalube 4 (or equivalent API SG or higher, SAE 10W-30 or 20W-40 based on temperature)
Oil Capacity:
Approx. 1.8 US qt (1.7 L) with filter change
Oil Filter Part Number:
Yamaha 5H0-13440-90-00 (or equivalent)
Transmission Type:
Constant mesh, 5-speed manual with reverse
Clutch Type:
Wet, multiple-disc, automatic centrifugal
Final Drive:
O-ring sealed chain, 520 pitch
Gear Ratios:
Specific ratios provided in manual, typically ranging from approx. 2.8 to 0.9 for forward gears and a specific reverse ratio.
Transmission Oil Type:
Yamalube 4 (or equivalent API SG or higher, SAE 10W-30 or 20W-40 based on temperature)
Transmission Oil Capacity:
Approx. 0.9 US qt (0.85 L)
Overall Length:
Approx. 70.9 inches (1798 mm)
Overall Width:
Approx. 43.7 inches (1110 mm)
Overall Height:
Approx. 43.1 inches (1095 mm)
Wheelbase:
Approx. 49.2 inches (1250 mm)
Ground Clearance:
Approx. 4.4 inches (112 mm) (under engine)
Dry Weight:
Approx. 390 lbs (177 kg)
Curb Weight:
Approx. 412 lbs (187 kg) (with all standard equipment and fluids)
Front Rack Capacity:
Not officially specified for significant load, designed for sport use.
Rear Rack Capacity:
Not officially specified for significant load, designed for sport use.
Safety Certification:
Manufactured to meet relevant safety standards for ATVs in its production era.
Braking System:
Hydraulic disc brakes front and rear for strong stopping power.
Suspension System:
Long-travel suspension (independent front, swingarm rear) for control over rough terrain.
Frame Construction:
Steel frame providing a robust chassis.
Anti Slip Grip Seat:
Designed to provide secure rider positioning.
Engine Oil Change:
Every 20 hours of operation or annually, whichever comes first.
Oil Filter Replacement:
Every oil change or every 40 hours of operation.
Air Filter Cleaning:
Every 10 hours of operation, or more frequently in dusty conditions.
Spark Plug Replacement:
Every 20 hours of operation or annually.
Valve Clearance Check:
Every 40 hours of operation.
Brake Fluid Flush:
Every 12 months or as needed.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid.
Coolant:
N/A (Air-cooled engine)
Carburetor Clogging:
Common with older ATVs due to fuel instability; requires regular cleaning and proper fuel storage.
Suspension Wear:
Bushings and bearings in the suspension can wear over time, requiring replacement for optimal handling.
Electrical Connections:
Corrosion or loose connections can cause intermittent electrical issues; the manual provides wiring diagrams for diagnosis.
Yamaha Motors Corporation:
Yamaha Motor Corporation, founded in 1955, is renowned for its diverse product range including motorcycles, marine products, and musical instruments, with a strong legacy in powersports.
Yfm350X Lineage:
The YFM350X Warrior was a significant model in Yamaha's sport ATV lineup, evolving from earlier models and contributing to the brand's strong presence in this segment.
Key Updates During Coverage:
While major platform changes were limited during 1997-2002, subtle refinements in suspension, chassis, and carburetion may have occurred. The manual will detail specific variations if present.
Production Location:
Likely manufactured in Japan or the United States by Yamaha Motor Corporation.
