Positioning:
The Yamaha TT-350 was a popular dual-sport motorcycle, bridging the gap between off-road trail capability and street legality. It was known for its robust performance and reliability in its class.
Competitors:
Competed with models like the Honda XL350R, Suzuki DR350, and Kawasaki KLR250/650 (depending on specific TT-350 variant and year).
Features:
Durable single-cylinder engine, capable suspension for varied terrain, reliable electrics, practical for both commuting and light trail riding.
Primary Coverage:
Workshop Service and Repair
Secondary Coverage:
Maintenance, Diagnostics, Troubleshooting
Estimated Page Count:
Variable, typically 200-400 pages for a comprehensive workshop manual of this era.
Type:
Workshop Service Manual / Repair Manual
Language:
English (presumed, based on product listing typical for international markets)
Engine:
Engine disassembly, assembly, inspection, tuning, lubrication, cooling system (air-cooled), cylinder head, piston, crankshaft, camshaft, valve train.
Fuel System:
Carburetor (likely Mikuni VM or similar), fuel tank, fuel lines, fuel pump (if applicable).
Ignition System:
CDI, spark plug, ignition coil, timing, stator, flywheel.
Transmission:
Clutch operation, transmission gear inspection, lubrication, shift mechanism, gearbox disassembly/assembly.
Drivetrain:
Final drive (chain and sprockets), swingarm, rear suspension linkage.
Suspension:
Front forks (telescopic, likely conventional or upside-down depending on sub-model), rear monoshock or twin shock absorber system, spring rates, damping adjustments, seal replacement.
Brakes:
Front and rear brake systems (likely disc brakes), caliper inspection, piston seals, brake pad replacement, hydraulic system bleeding, master cylinder, brake lines.
Electrical System:
Wiring diagrams, lighting (headlight, taillight, turn signals), battery, charging system (alternator/stator), starter motor (if electric start equipped), fuses, switches, instrument panel.
Chassis Frame:
Frame inspection, headstock bearings, wheel bearings, steering system.
Bodywork:
Fenders, fuel tank, seat, side covers, graphics.
Routine Maintenance:
Oil changes, filter replacements, chain lubrication and adjustment, air filter cleaning/replacement, spark plug checks, brake adjustments, tire pressure checks, battery maintenance.
Troubleshooting:
Diagnostic charts, common problems and solutions, electrical system troubleshooting, engine performance issues.
Repair Procedures:
Detailed step-by-step instructions for component removal, disassembly, cleaning, inspection, repair, and reassembly.
Tuning And Adjustment:
Carburetor jetting and adjustment, ignition timing checks, suspension adjustments.
Special Tools:
Identification and usage of special tools required for specific repair or maintenance tasks.
Depth:
Comprehensive, covering everything from basic rider maintenance to major engine rebuilds and chassis component repairs. Suitable for both amateur mechanics and professional technicians.
Type:
Four-stroke, single-cylinder, air-cooled (typical configuration).
Displacement:
Approximately 347cc (exact displacement may vary slightly by year/specific model variant).
Bore X Stroke:
Typical for the era: ~80mm x 69mm (specifics require manual verification).
Compression Ratio:
Likely in the range of 8.5:1 to 9.5:1 (specifics require manual verification).
Horsepower:
Estimated 25-30 hp (specifics require manual verification and depend on year/tuning).
Torque:
Estimated 20-25 lb-ft (specifics require manual verification and depend on year/tuning).
Carburetor:
Likely a single Mikuni carburetor, possibly VM34 or similar size, with specific jetting for optimal performance and emissions.
Fuel Type:
Unleaded gasoline (Octane rating as specified in manual, typically 87 or higher).
Oil Type:
Motorcycle-specific 4-stroke engine oil, e.g., SAE 10W-40 or 20W-50, API SG or higher (confirm specific viscosity and API rating in manual).
Oil Capacity:
Approximately 1.6-2.0 liters (confirm exact capacity with filter change in manual).
Length:
Variable by year, typical ~2100-2250 mm.
Width:
Variable by year, typical ~800-900 mm (handlebar width).
Height:
Variable by year, typical ~1200-1300 mm (seat height or overall).
Wheelbase:
Typical ~1400-1450 mm.
Dry Weight:
Estimated 120-140 kg (confirm specific year's dry weight in manual).
Wet Weight:
Estimated 130-150 kg (including fluids, confirm in manual).
Fuel Capacity:
Typically 9-12 liters (confirm in manual).
Oil Change:
Every 3,000 km or 6 months, whichever comes first (typical, confirm in manual).
Air Filter:
Inspect every 1,000 km, clean/replace as needed (more frequently if ridden in dusty conditions, confirm in manual).
Spark Plug:
Inspect every 3,000 km, replace as needed or every 6,000-10,000 km (confirm gap in manual).
Chain Lubrication Adjustment:
Every 500 km or after washing/rain (confirm slack specification in manual).
Valve Clearance:
Check every 6,000-10,000 km or as specified in manual. Critical for engine performance and longevity.
Brake Fluid:
DOT 3 or DOT 4 brake fluid (confirm specific type and replacement interval in manual).
Fork Oil:
Specific viscosity (e.g., 10W) and volume per fork leg (confirm in manual).
Coolant:
N/A (Air-cooled engine)
Common Wear Items:
Clutch plates, chain and sprockets, wheel bearings, steering head bearings, fork seals, carburetor jets (prone to clogging if fuel is left sitting).
Electrical Gremlins:
Wiring harness issues, stator failures, and regulator/rectifier problems can occur with age, as with many motorcycles of this era. Thorough electrical checks are important.
Carburetor Issues:
Float bowl corrosion or needle wear can affect fuel delivery. Gumming from stale fuel is common if not stored properly.
Suspension Wear:
Front fork seals can leak, and rear shock absorbers may lose damping effectiveness over time. Bushings in the swingarm and linkages can also wear.
Heritage:
Yamaha has a long and successful history in motorcycle racing and production, known for innovation, performance, and reliability across various disciplines.
Evolution:
The TT series generally evolved from more competition-focused models towards more street-legal dual-sport variants over the years. The TT-350 likely saw minor updates in suspension, brakes, and styling during its production run.
Production Years:
1985-2000 (as per manual coverage, indicating a long and successful production life).
Manufacturing Location:
Likely manufactured in Japan or other Yamaha global production facilities.
