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Introduction
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Market Position
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Atv Segment:
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Sport ATV, known for its performance and handling in its era.
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Competitive Analysis
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Key Competitors:
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Honda TRX300EX/400EX, Suzuki LT-Z250/400, Kawasaki Mojave 250.
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Key Features
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Performance Focus:
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The YFM350X Warrior was designed for sport riding, offering a good balance of power, agility, and suspension travel for its time.
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Reliability:
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Yamaha's reputation for robust and reliable engines is reflected in the YFM350X.
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Value Proposition
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Manual Value:
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Essential for owners and technicians to maintain, diagnose, and repair the YFM350X efficiently, ensuring longevity and optimal performance.
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Manual Coverage
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Systems Covered
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Engine Systems:
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Engine assembly, disassembly, inspection, tuning, carburetor, cooling system, lubrication system, valve train, piston, crankshaft, cylinder head, cylinder block.
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Drivetrain Systems:
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Clutch (automatic centrifugal), transmission (5-speed with reverse), final drive, drive shafts, differential (if applicable, though typically solid rear axle).
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Chassis Systems:
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Frame inspection and repair, suspension (front and rear), steering system, wheels, tires.
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Braking Systems:
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Front and rear brake systems (hydraulic disc brakes), brake caliper service, brake fluid replacement, master cylinder.
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Electrical Systems:
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Ignition system, charging system (stator, rectifier/regulator), lighting, battery, starter motor, wiring diagrams, switches, fuses.
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Fuel System:
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Fuel tank, fuel lines, fuel filter, carburetor (Mikuni VM32SS or similar), fuel pump (if applicable).
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Exhaust System:
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Exhaust pipe, muffler, gaskets.
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Body And Trim:
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Fenders, plastic body panels, seat, handlebars, controls.
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Procedures Included
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Maintenance Procedures:
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Oil change, filter replacement, air filter cleaning/replacement, spark plug replacement, chain adjustment, brake bleeding, valve clearance adjustment.
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Repair Procedures:
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Engine overhaul, transmission rebuild, carburetor overhaul, suspension component replacement, brake system repair, electrical component testing and replacement.
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Troubleshooting Guides:
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Diagnostic charts, common problems and solutions, symptom-based troubleshooting.
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Technical Specifications:
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Torque specifications, clearances, measurements, wiring schematics, diagnostic codes (if applicable).
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Technical Depth
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Depth Of Coverage:
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Comprehensive, covering from routine maintenance to complete engine and transmission overhauls, including detailed diagnostic procedures and specifications.
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Engine Specifications
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Primary Engine
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Engine Type:
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4-stroke, SOHC, air-cooled
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Displacement:
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348 cc (21.2 cu in)
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Bore X Stroke:
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81 mm x 68 mm (approximate)
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Compression Ratio:
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9.7:1 (typical)
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Valve Configuration:
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SOHC, 2 valves
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Performance
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Horsepower:
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Approximately 20-22 HP at 6,500 RPM (estimated, subject to variation)
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Torque:
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Approximately 21-23 lb-ft at 5,000 RPM (estimated, subject to variation)
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Fuel System
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Carburetor Model:
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Mikuni VM32SS (or similar specification)
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Fuel Type:
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Unleaded gasoline, minimum octane rating 87
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Fuel Tank Capacity:
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2.6 US gal (9.8 L)
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Cooling System
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Cooling Method:
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Air-cooled
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Lubrication System
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Oil Type:
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Yamalube 4 (or equivalent API SG or higher, SAE 10W-30 or 20W-40 based on temperature)
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Oil Capacity:
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Approx. 1.8 US qt (1.7 L) with filter change
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Oil Filter Part Number:
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Yamaha 5H0-13440-90-00 (or equivalent)
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Transmission
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Standard
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Transmission Type:
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Constant mesh, 5-speed manual with reverse
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Clutch Type:
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Wet, multiple-disc, automatic centrifugal
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Final Drive:
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O-ring sealed chain, 520 pitch
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Features
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Gear Ratios:
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Specific ratios provided in manual, typically ranging from approx. 2.8 to 0.9 for forward gears and a specific reverse ratio.
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Transmission Oil Type:
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Yamalube 4 (or equivalent API SG or higher, SAE 10W-30 or 20W-40 based on temperature)
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Transmission Oil Capacity:
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Approx. 0.9 US qt (0.85 L)
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Dimensions
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Exterior
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Overall Length:
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Approx. 70.9 inches (1798 mm)
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Overall Width:
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Approx. 43.7 inches (1110 mm)
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Overall Height:
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Approx. 43.1 inches (1095 mm)
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Wheelbase:
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Approx. 49.2 inches (1250 mm)
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Ground Clearance:
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Approx. 4.4 inches (112 mm) (under engine)
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Weights
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Dry Weight:
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Approx. 390 lbs (177 kg)
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Curb Weight:
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Approx. 412 lbs (187 kg) (with all standard equipment and fluids)
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Cargo
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Front Rack Capacity:
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Not officially specified for significant load, designed for sport use.
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Rear Rack Capacity:
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Not officially specified for significant load, designed for sport use.
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Maintenance
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Service Intervals
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Engine Oil Change:
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Every 20 hours of operation or annually, whichever comes first.
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Oil Filter Replacement:
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Every oil change or every 40 hours of operation.
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Air Filter Cleaning:
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Every 10 hours of operation, or more frequently in dusty conditions.
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Spark Plug Replacement:
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Every 20 hours of operation or annually.
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Valve Clearance Check:
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Every 40 hours of operation.
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Brake Fluid Flush:
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Every 12 months or as needed.
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Fluid Specifications
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Brake Fluid:
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DOT 3 or DOT 4 hydraulic brake fluid.
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Coolant:
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N/A (Air-cooled engine)
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Known Issues
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Carburetor Clogging:
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Common with older ATVs due to fuel instability; requires regular cleaning and proper fuel storage.
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Suspension Wear:
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Bushings and bearings in the suspension can wear over time, requiring replacement for optimal handling.
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Electrical Connections:
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Corrosion or loose connections can cause intermittent electrical issues; the manual provides wiring diagrams for diagnosis.
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Vehicle History
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Brand Heritage
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Yamaha Motors Corporation:
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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.
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Model Evolution
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Yfm350X Lineage:
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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.
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Key Updates During Coverage:
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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.
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Production
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Production Location:
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Likely manufactured in Japan or the United States by Yamaha Motor Corporation.
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