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Introduction
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Market Position
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Market Position:
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The Yamaha Moto-4 350 was a popular utility and recreational ATV in its era, known for its robust performance and reliability. This manual serves as an essential resource for owners and mechanics to maintain and repair these classic machines.
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Competitive Analysis
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Competitive Analysis:
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Competed against models from Honda (e.g., TRX series), Suzuki (e.g., QuadSport series), and Kawasaki (e.g., Bayou series). The Moto-4 350 offered a strong balance of power and versatility.
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Key Features
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Key Features:
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Comprehensive coverage of all major mechanical and electrical systems, detailed illustrations and diagrams, extensive troubleshooting section, and precise technical specifications make this manual an indispensable tool for preserving the functionality and longevity of the Yamaha Moto-4 350.
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Manual Coverage
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Systems Covered
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Engine Systems:
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Complete engine tear down and rebuild, lubrication, cooling system, fuel system (carburetor, fuel pump), ignition system, starting system (electric start, kickstart), exhaust system.
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Drivetrain Systems:
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Transmission, clutch, drive shaft, primary reduction gear, reverse gear, gearshift mechanism.
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Chassis Systems:
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Frame, suspension (front forks, rear suspension, swingarm), steering system (handlebar, triple tree), wheels, tires, brakes (front and rear, hydraulic, rotors, pads), bodywork, plastics, fenders.
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Electrical Systems:
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Battery, charging system (stator, rectifier, regulator), ignition coil, lights, switches, starter motor.
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Procedures Included
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Maintenance Procedures:
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Scheduled maintenance, oil changes, filter replacement, spark plug inspection/replacement, air filter cleaning/replacement, valve clearance adjustment, brake system maintenance, chain adjustment, lubrication points.
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Repair Procedures:
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Complete engine overhaul, carburetor rebuild, transmission repair, suspension component replacement, brake caliper service, electrical component diagnosis and repair, body panel repair/replacement.
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Troubleshooting:
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Comprehensive troubleshooting guides for common issues such as starting problems, no spark, poor engine performance, carburetor issues, transmission shifting problems, electrical faults.
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Installation Procedures:
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Installation of various components and accessories (where applicable).
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Technical Depth
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Technical Depth:
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Full factory-level detail, suitable for DIY enthusiasts and professional mechanics. Includes complete tear-down and rebuild instructions, detailed diagrams, torque specifications, and diagnostic procedures.
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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, single-cylinder
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Displacement:
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348 cc (21.2 cubic inches)
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Bore X Stroke:
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83.0 mm x 64.5 mm (approximate, varies by specific sub-model)
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Compression Ratio:
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8.5:1 (typical)
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Performance
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Horsepower:
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Approximately 20-25 HP (estimated, not explicitly stated in product info)
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Torque:
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Not specified in product info, but torque specs are included within the manual.
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Fuel System
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Carburetor:
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Single Mikuni carburetor (specific model usually Mikuni BS34 or similar), fuel pump.
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Fuel Type:
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Unleaded gasoline
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Ignition
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Ignition System:
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CDI (Capacitor Discharge Ignition)
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Lubrication
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Oil Type:
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Yamaha recommends Yamalube or a comparable high-quality SAE 10W-30 API SG or higher motorcycle oil. The manual will specify exact viscosity and API classification.
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Oil Capacity:
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Refer to manual for exact capacity, typically around 1.5 - 2.0 liters.
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Maintenance
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Service Intervals
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Oil Change Interval:
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Typically every 1000 km or 6 months, but the manual will provide precise intervals based on operating conditions.
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Air Filter Maintenance:
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Recommended cleaning at 1000 km or more frequently in dusty conditions.
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Valve Clearance Check:
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Recommended inspection at 5000 km or as specified in the manual for optimal performance.
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Fluid Specifications
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Engine Oil Specification:
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SAE 10W-30 API SG or higher motorcycle oil. Specific viscosity may vary with ambient temperature as detailed in the manual.
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Brake Fluid Specification:
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DOT 3 or DOT 4 hydraulic brake fluid (check manual for exact specification).
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Coolant Specification:
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Not applicable for this air-cooled engine.
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Known Issues
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Common Issues:
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Carburetor gumming due to fuel sitting, starting issues (especially if electric starter is weak), rear brake performance degradation, wear on suspension components, and potential electrical gremlins over time.
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Troubleshooting Areas:
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The manual specifically addresses 'no spark' and carburetor-related problems, indicating these are common areas of concern for this model.
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