Manual Coverage
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Systems Covered
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Engine:
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Engine disassembly, assembly, inspection, troubleshooting, tuning, and rebuilding
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Fuel System:
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Fuel pump, carburetor (or fuel injection if applicable), fuel lines, fuel filter inspection and replacement
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Ignition System:
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Ignition coil, spark plugs, CDI unit, timing inspection and adjustment
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Cooling System:
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Radiator, coolant, water pump, thermostat, fan operation and maintenance
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Transmission Drivetrain:
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Transmission overhaul, clutch inspection, drive shafts, differentials, and final drive maintenance
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Suspension:
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Front and rear suspension components, shock absorbers, bushings, and alignment procedures
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Brakes:
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Brake system inspection, hydraulic lines, brake pads, rotors, calipers, and bleeding procedures
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Electrical System:
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Wiring diagrams, battery, charging system, lighting, starter motor, and all electrical components troubleshooting
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Chassis Frame:
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Frame inspection, welds, and chassis component mounting
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Bodywork:
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Body panels, fenders, racks, and plastic component removal and installation
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Steering:
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Steering column, tie rods, wheel hub inspection and adjustment
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Procedures Included
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Maintenance:
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Scheduled maintenance, fluid changes, filter replacement, lubrication
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Troubleshooting:
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Diagnostic procedures for common and complex issues across all systems
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Repair:
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Step-by-step instructions for component repair and replacement
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Rebuilds:
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Detailed instructions for engine and transmission rebuilds
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Adjustments:
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Carburetor tuning, valve adjustments, brake adjustments
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Wiring Diagrams:
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Comprehensive electrical system wiring schematics
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Technical Depth
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Depth:
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Professional level, suitable for mechanics and advanced DIY users
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Detail Level:
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Hundreds of pages with detailed photos & diagrams, exploded views
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Engine Specifications
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Primary Engine
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Engine Type:
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Air-cooled, 4-stroke, SOHC, 2-valve (typical for this era/model)
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Engine Displacement 350:
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Approximately 348cc (specific model may vary slightly)
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Engine Displacement 400:
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Approximately 386cc (specific model may vary slightly)
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Performance
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Horsepower 350:
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Estimated 21-23 HP (typical)
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Horsepower 400:
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Estimated 26-28 HP (typical)
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Fuel System
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Carburetor Type:
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Mikuni (common, specific model varies, e.g., Mikuni BSR33/34)
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Fuel Type:
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Unleaded gasoline
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Maintenance
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Service Intervals
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Oil Change Interval:
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Typically every 1,000-1,500 miles or 6-12 months (refer to manual for precise intervals)
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Air Filter Cleaning:
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Frequent inspection and cleaning/replacement, especially in dusty conditions
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Spark Plug Replacement:
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Intervals of 3,000-5,000 miles or as specified
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Fluid Specifications
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Engine Oil Type:
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Yamalube 4 (or equivalent JASO MA certified 10W-40 or 20W-50 motorcycle oil)
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Engine Oil Capacity:
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Approximately 1.7-2.0 Liters (check manual for exact capacity with filter change)
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Coolant Type:
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Yamaha's Super Coolant or equivalent ethylene glycol-based antifreeze (50/50 mix with distilled water)
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Brake Fluid Type:
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DOT 3 or DOT 4 hydraulic brake fluid
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Cv Transmission Fluid:
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CVT Oil (specific Yamaha part number or equivalent)
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Known Issues
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Common Wear Items:
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CVT belt wear, wheel bearings, tie rod ends, brake pad wear
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Carburetor Cleaning:
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Carburetors may require periodic cleaning due to fuel deposits, especially with ethanol blends.
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Electrical Connectors:
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Corrosion or loose connections in wiring harnesses can cause intermittent issues.
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