Engine Mechanical:
Complete engine disassembly, inspection, repair, and reassembly procedures for the 348cc four-stroke single-cylinder engine. Includes piston, rings, cylinder, crankshaft, connecting rod, valve train (camshaft, valves, springs, rockers), and lubrication system.
Fuel System:
Carburetor tuning, cleaning, and overhaul (likely Mikuni VM series). Includes fuel tank, petcock, fuel lines, and air filter system.
Ignition System:
CDI ignition system troubleshooting, component testing (coil, ignition module, pickup coil), spark plug selection and gap, timing verification.
Transmission:
Clutch operation and adjustment, gear shifting mechanisms, internal transmission component inspection and repair, gearbox oil specifications and change procedures.
Electrical System:
Wiring diagrams, lighting circuits (headlight, taillight, indicators), charging system (stator, regulator/rectifier), battery maintenance, horn, starter system (if applicable), fuse identification and replacement.
Suspension:
Front fork service (oil type, level, seals), rear shock absorber (preload adjustment, rebuild procedures if applicable), linkage maintenance.
Braking System:
Front and rear brake caliper service, brake pad replacement, brake line inspection, master cylinder overhaul, brake fluid specifications and bleeding procedures.
Wheels And Tires:
Tire size specifications, recommended pressures, spoke tension adjustment, wheel bearing inspection and replacement.
Frame And Bodywork:
Frame inspection for damage, handlebar replacement, seat removal, fuel tank removal and installation, fender and fairing components.
Routine Maintenance:
Oil changes, filter replacement, air filter cleaning, chain adjustment and lubrication, spark plug inspection/replacement, brake system checks, tire pressure checks.
Troubleshooting Guides:
Diagnostic flowcharts and symptom-based troubleshooting for common issues related to starting, running, electrical faults, and mechanical problems.
Major Repairs:
Engine top-end rebuilds, transmission overhauls, suspension fork rebuilds, carburetor rebuilds.
Component Removal And Installation:
Step-by-step instructions for removing and reinstalling all major components.
Special Tool Identification:
Identification of specialized tools required for specific maintenance and repair tasks.
Torque Specifications:
Detailed torque values for all critical fasteners, engine components, chassis bolts, and electrical connections.
Diagnostic Charts:
Systematic diagnostic charts for identifying and rectifying common problems.
Depth Of Coverage:
Comprehensive. Covers everything from basic owner maintenance to full engine and transmission rebuilds, including detailed specifications and tolerances.
Wiring Diagrams:
Comprehensive, full-color (if originally published as such, or clear black and white) wiring diagrams for all electrical systems.
Component Diagrams:
Detailed exploded views of all major assemblies for easy identification of parts and proper reassembly.
Engine Type:
Four-stroke, SOHC, single-cylinder
Displacement:
348 cc (approximately)
Bore X Stroke:
Likely around 82mm x 67mm (typical for Yamaha singles of this era, specific figures in manual).
Compression Ratio:
Expected to be around 9.5:1 to 10.5:1, as specified in the manual.
Horsepower:
Estimated 25-30 HP (actual figures vary by year and specific tune, detailed in manual).
Torque:
Estimated 20-25 lb-ft (actual figures vary by year and specific tune, detailed in manual).
Carburetor Type:
Likely a single Mikuni VM series carburetor (e.g., VM34).
Fuel Type:
Unleaded gasoline (Octane rating as specified in manual, likely 87 or higher).
Oil Type:
Yamaha recommends specific motorcycle-grade oils (e.g., SAE 10W-40 or 20W-50, API SG or higher, JASO MA certified). Refer to manual for precise specifications.
Oil Capacity:
Approximately 1.6-1.8 liters with filter change. Exact capacity in manual.
Overall Length:
Varies by year, approx. 2195 mm (86.4 in) for earlier models. Consult manual for specific year dimensions.
Overall Width:
Varies by year, approx. 830 mm (32.7 in). Consult manual for specific year dimensions.
Overall Height:
Varies by year, approx. 1220 mm (48.0 in). Consult manual for specific year dimensions.
Dry Weight:
Approximately 123 kg (271 lbs). Manual will confirm exact weights for specific variants.
Wet Weight:
Approximately 130-135 kg (287-298 lbs), including fluids. Manual will specify.
Fuel Capacity:
Approximately 9.5 liters (2.5 US gal), including reserve. Manual will specify exact capacity.
Wheelbase:
Approximately 1405 mm (55.3 in). Manual will confirm.
Engine Oil Change:
Every 3,000 km (1,800 miles) or 6 months, whichever comes first. Refer to manual for exact mileage/timeframe.
Air Filter Cleaning:
Every 1,000 km (600 miles) or more frequently in dusty conditions. Manual will specify cleaning or replacement.
Spark Plug Check:
Every 5,000 km (3,000 miles). Manual will provide gap and torque specifications.
Chain Lubrication Adjustment:
Every 500 km (300 miles) or as needed based on slack. Manual specifies adjustment procedure.
Valve Clearance Check:
Every 10,000 km (6,000 miles) or annually. Manual provides detailed procedure and specifications.
Brake Fluid Type:
DOT 3 or DOT 4 Hydraulic Brake Fluid (refer to manual for exact specification).
Fork Oil Type:
Yamaha Fork Oil (e.g., SAE 10W) or equivalent. Manual will specify viscosity and capacity per fork leg.
Common Wear Items:
Clutch wear, brake pad wear, chain and sprockets wear, fork seal leaks. Manual addresses diagnosis and replacement.
Carburetor Cleaning:
Can require periodic cleaning due to fuel varnish if the bike sits for extended periods.
Electrical Connections:
Corrosion on connectors can sometimes cause intermittent issues, especially in damp environments. Manual's wiring diagrams are essential for tracing faults.
