|
Introduction
|
|
Market Position
|
|
Vehicle Segment:
|
Mid-size utility ATV, known for its reliable performance and versatility in recreational and light utility applications.
|
|
Competitive Analysis
|
|
Key Competitors:
|
Honda FourTrax 300/350, Suzuki QuadSport 250/300, Kawasaki Bayou 300/400.
|
|
Key Features
|
|
Vehicle Strengths:
|
Durable air-cooled engine, reliable shaft drive, comfortable suspension for its class, robust chassis.
|
|
Manual Value Proposition
|
|
Manual Benefit:
|
Enables DIY repairs, reduces mechanic costs, ensures proper maintenance for longevity, and aids in diagnosing complex issues.
|
|
Manual Coverage
|
|
Systems Covered
|
|
Engine System:
|
Complete overhaul, top-end (cylinder, piston, valves), bottom-end (crankshaft, bearings), cooling system, lubrication system
|
|
Fuel System:
|
Carburetor disassembly, cleaning, adjustment, fuel pump, fuel lines, fuel tank maintenance
|
|
Transmission System:
|
Clutch operation and adjustment, gear shifting mechanisms, transmission fluid checks and changes
|
|
Drivetrain:
|
Driveshaft inspection and maintenance, rear differential lubrication and inspection
|
|
Suspension:
|
Front and rear suspension component inspection, shock absorber servicing, spring and linkage maintenance
|
|
Brakes:
|
Brake caliper service, brake pad replacement, brake fluid bleeding, brake line inspection
|
|
Electrical System:
|
Ignition system (spark plug, coil, CDI), starting system (starter motor, battery), charging system (stator, regulator/rectifier), lighting, wiring diagrams, troubleshooting electrical faults
|
|
Chassis:
|
Frame inspection, steering system maintenance, wheel and tire checks, body panel removal and installation
|
|
Procedures Included
|
|
Maintenance Procedures:
|
Periodic inspection schedule, lubrication points and intervals, filter replacement (air, oil), spark plug gap and replacement
|
|
Repair Procedures:
|
Step-by-step instructions for component disassembly, reassembly, and adjustment
|
|
Overhaul Procedures:
|
Detailed procedures for engine and transmission rebuilds
|
|
Troubleshooting Guides:
|
Diagnostic trees for common problems, identifying symptoms and potential causes
|
|
Technical Depth
|
|
Diagnostic Capabilities:
|
Advanced diagnostics for engine performance, electrical system faults, and mechanical issues
|
|
Rebuild Depth:
|
Comprehensive instructions for complete engine and transmission rebuilds, including component tolerances and specifications
|
|
Engine Specifications
|
|
Primary Engine
|
|
Engine Type:
|
4-stroke, SOHC, air-cooled
|
|
Displacement:
|
348cc
|
|
Bore X Stroke:
|
83 mm x 64.5 mm (Typical for this engine family)
|
|
Compression Ratio:
|
8.8:1 (Typical)
|
|
Valve Configuration:
|
SOHC, 2 valves per cylinder
|
|
Performance
|
|
Horsepower:
|
Approx. 21-23 HP (Estimated, actual may vary slightly)
|
|
Torque:
|
Approx. 20-22 lb-ft (Estimated)
|
|
Fuel System
|
|
Carburetor Model:
|
Mikuni BNS32 (Likely, common for Yamaha 350s of this era)
|
|
Fuel Type:
|
Unleaded gasoline
|
|
Fuel Tank Capacity:
|
Approx. 3.17 US gal (12 liters)
|
|
Lubrication System
|
|
Oil Type:
|
Yamalube 4 (or equivalent API SG, SAE 20W-40, JASO MA)
|
|
Oil Capacity With Filter:
|
Approx. 1.77 US qt (1.68 L)
|
|
Maintenance
|
|
Service Intervals
|
|
Engine Oil Change:
|
Every 100 hours or 6 months (whichever comes first), or more frequently under severe use.
|
|
Air Filter Cleaning:
|
Every 20 hours or monthly, more often in dusty conditions.
|
|
Spark Plug Inspection:
|
Every 100 hours or 6 months.
|
|
Final Drive Oil Change:
|
Every 100 hours or 6 months.
|
|
Fluid Specifications
|
|
Engine Oil Specification:
|
Yamalube 4 (or SAE 20W-40 API SG, JASO MA)
|
|
Final Drive Oil Specification:
|
Yamaha Hypoid Gear Oil (or SAE 80 API GL-4)
|
|
Brake Fluid Specification:
|
DOT 3 or DOT 4.
|
|
Known Issues
|
|
Common Wear Items:
|
Tie rod ends, ball joints, wheel bearings, brake pads, swingarm bushings, drive shaft U-joints, carburetor jets (clogging).
|
|
Engine Concerns:
|
Carbon buildup on valves due to air-cooling, potential for starter clutch wear, carburetor adjustment sensitivity to altitude/fuel quality.
|
|
Electrical Concerns:
|
Stator failure, regulator/rectifier issues, starter solenoid wear (less common but possible).
|
