Segment:
Performance Sport ATV
Target Audience:
Enthusiasts seeking reliable performance and maintenance capabilities for their Yamaha YFM350X Warrior.
Competitors:
Honda TRX300EX, Suzuki LT250R/LT300EF, Kawasaki Mojave 250
Vehicle Highlight:
Known for its agile handling and torquey engine, making it a popular choice for recreational riding and trail use.
Manual Benefit:
Inexpensive and effective method to maintain and repair the vehicle, saving on professional service costs.
Vehicle Systems:
Engine, Fuel System, Ignition System, Transmission, Drivetrain, Suspension, Steering, Brakes, Electrical System, Chassis, Bodywork
Type:
Service and Repair Manual
Engine:
Detailed disassembly, assembly, inspection, and repair procedures for the 348cc 4-stroke SOHC engine.
Fuel System:
Carburetor tuning, cleaning, and rebuilding (Mikuni VM series); fuel pump inspection and replacement.
Ignition System:
CDI unit testing, spark plug specifications, ignition timing adjustment.
Transmission Drivetrain:
5-speed manual transmission with reverse; clutch adjustment and replacement; chain drive maintenance and adjustment; wheel bearing service.
Suspension:
Front independent A-arm suspension; rear swingarm suspension; shock absorber adjustment and replacement; grease points.
Steering:
Handlebar and steering stem bearing maintenance; tie rod end inspection.
Brakes:
Front dual hydraulic disc brakes; rear hydraulic disc brake; brake fluid specifications and bleeding procedures; pad inspection and replacement.
Electrical System:
Wiring diagrams, battery specifications, starter motor and system troubleshooting, lighting system diagnosis.
Chassis Bodywork:
Frame inspection, body panel removal and installation, seat maintenance, footpeg assembly.
Maintenance:
Scheduled maintenance checks, oil changes, filter replacements, lubrication points, chain tension adjustment.
Troubleshooting:
Diagnostic charts for common problems such as starting issues, poor running, and electrical faults.
Repair:
Step-by-step instructions for component repair, replacement, and overhaul.
Diagnostics:
Identification of faulty components and systems using symptom-based troubleshooting.
Depth:
Comprehensive coverage from basic user maintenance to in-depth mechanical and electrical diagnostics and repairs, suitable for home mechanics and professional technicians.
Engine Type:
4-stroke, SOHC, Air-cooled
Displacement:
348cc (348 cm³)
Bore X Stroke:
83.0 mm x 64.5 mm
Horsepower:
Approx. 25-28 HP (Varies slightly by year/tuning)
Torque:
Approx. 20-22 lb-ft (Varies)
Carburetor Model:
Mikuni VM32SS
Fuel Type:
Unleaded Gasoline, 87 Octane or higher
Ignition Type:
CDI (Capacitor Discharge Ignition)
Type:
5-speed manual with Reverse
Clutch Type:
Wet, multi-disc
Drive Type:
O-ring sealed chain, 520 pitch
Transmission Oil Type:
Yamaha Genuine Yamalube 4 (or equivalent API SE, SF, SG, SH, SJ Service Classification SAE 20W-40 or 10W-30)
Transmission Oil Capacity:
1.60 L (1.7 US qt)
Atv Safety:
As an ATV, rider safety is paramount and depends heavily on operator skill, protective gear, and adherence to trail conditions. Yamaha emphasizes safe riding practices.
Brakes:
Hydraulic disc brakes front and rear provide reliable stopping power.
Frame Construction:
Robust steel frame designed for off-road durability.
Tires:
Knobby off-road tires for traction and stability.
Engine Oil Change:
Every 20 hours or 3 months, whichever comes first (severe use). Refer to manual for normal use intervals.
Spark Plug Inspection:
Every 20 hours or 3 months.
Air Filter Cleaning:
Every 10 hours or 1 month, or more frequently in dusty conditions.
Chain Lubrication Adjustment:
Every 10 hours or 1 month.
Engine Oil Type:
Yamalube 4 (or equivalent API SE, SF, SG, SH, SJ Service Classification SAE 20W-40 or 10W-30)
Engine Oil Capacity:
1.60 L (1.7 US qt) with filter change
Brake Fluid Type:
DOT 3 or DOT 4
Common Wear Items:
Clutch plates, front wheel bearings, steering stem bearings, carburetor performance (jetting).
Carburetor Tuning:
Can be sensitive to altitude and temperature changes; requires periodic adjustment or cleaning for optimal performance.
Storage Preparation:
Fuel stabilizer, battery tender, and proper cleaning are essential for off-season storage.
Yamaha Legacy:
Yamaha Motor Company has a long history of excellence in powersports, known for innovation in motorcycles, ATVs, and marine products.
Yfm350X Lineage:
The YFM350X Warrior was a cornerstone of Yamaha's sport ATV lineup, evolving from earlier models and setting a benchmark for performance and handling in its class.
Production Period:
Introduced in the mid-1980s, with the covered generation spanning 1997-2002.
Manufacturing Location:
Primarily Japan
