🏷️ Basic Information

Make:

Yamaha

Model:

TT-350

Model Notes:

Dual-purpose motorcycle, often referred to as a 'dual sport' or 'enduro' bike.

Vin Decoder Notes:

VIN structure varies by year and region, typically starting with 'JY' for Japan. Decoding requires year-specific charts.

👋 Introduction

Segment:

Dual-sport motorcycle, catering to riders seeking off-road capability with street legality. Competes in the lightweight to mid-weight dual-sport class.

Target Audience:

Enthusiasts for trail riding, adventure touring, and light commuting.

Competitors Era:

Honda XR series, Kawasaki KLR series, Suzuki DR series, KTM EXC series (depending on specific performance attributes).

Design Philosophy:

Robust, reliable, and trail-capable motorcycle with a focus on accessible performance and ease of maintenance.

Standout Attributes:

Good power-to-weight ratio for its class, durable construction, and versatile performance across various terrains.

📋 Manual Details

Years Covered:

1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000

Market Coverage:

Likely covers models sold in North America and potentially European markets, but specific regional variations are not detailed.

Estimated Page Count:

Varies by specific edition, but typically between 300-500 pages for a comprehensive service manual.

Type:

Service Manual / Repair Manual

Purpose:

Designed for qualified technicians and experienced DIY mechanics for maintenance, diagnosis, and repair.

Language:

English

Format:

PDF Download

📖 Manual Coverage

Engine:

Complete engine disassembly, assembly, overhaul, tuning, and troubleshooting. Covers top-end (cylinder head, valves, camshaft) and bottom-end (crankshaft, connecting rod, piston, bearings).

Fuel System:

Carburetor removal, cleaning, adjustment, and rebuilding (likely Mikuni VM series). Fuel tank, petcock, fuel lines, and fuel filter maintenance.

Ignition System:

CDI (Capacitor Discharge Ignition), stator, ignition coil, spark plug diagnosis and replacement. Timing specifications and adjustment procedures.

Transmission:

Gearbox disassembly, assembly, inspection, and repair. Clutch operation, adjustment, and replacement. Gear selection mechanisms.

Drivetrain:

Chain drive system maintenance (cleaning, lubrication, adjustment, replacement). Sprocket inspection. Rear wheel hub and bearing service.

Suspension:

Front fork overhaul, seal replacement, oil changes, and internal component inspection. Rear shock absorber inspection and adjustment. Swingarm and linkage bearing service.

Brakes:

Hydraulic disc brake systems (front and rear). Caliper inspection, piston service, pad replacement, bleeding procedures. Master cylinder overhaul. Brake fluid specifications.

Electrical System:

Wiring diagrams for all circuits. Headlight, taillight, turn signals, brake light operation. Battery maintenance and charging system diagnosis. Fuses and relays.

Cooling System:

Air-cooled engine; detailed instructions for fin cleaning and airflow optimization.

Frame And Bodywork:

Frame inspection for damage, steering head bearing service. Fuel tank removal and installation, seat, fenders, and side cover maintenance.

Routine Maintenance:

Oil changes, filter replacement, spark plug checks, chain adjustment, brake checks, tire pressure, general lubrication, and bolt torquing.

Troubleshooting:

Diagnostic flowcharts and symptom-based troubleshooting for common issues (e.g., starting problems, poor performance, electrical faults).

Engine Rebuild:

Step-by-step instructions for complete engine teardown, component measurement (bore, stroke, clearances), piston ring replacement, valve lapping, and reassembly.

Suspension Overhaul:

Detailed fork seal replacement, fork oil type and level specifications, and rear shock absorber maintenance.

Carburetor Rebuild:

Jetting specifications, needle positions, idle speed adjustment, and troubleshooting common carburetor issues.

Electrical Diagnostics:

Use of multimeters, continuity testing, resistance checks, and voltage readings to diagnose electrical faults.

Brake System Service:

Bleeding sequences, caliper piston retraction, and proper brake pad installation.

Depth:

Comprehensive. Covers everything from basic fluid changes to complete engine and transmission rebuilds, including detailed torque specifications and wear limits.

Diagnostics:

Advanced diagnostic procedures for engine performance and electrical systems.

Special Tools:

Lists or describes necessary special tools required for specific procedures (e.g., flywheel puller, clutch holder tool).

📊 Manual Specifications

File Type:

PDF

Searchable Text:

Typically yes, allowing for quick navigation and keyword searches.

Image Resolution:

High resolution, suitable for clear viewing of diagrams and illustrations.

Binding:

N/A (Digital Download)

Paper Quality:

N/A (Digital Download)

⚙️ Engine Specifications

Type:

Four-stroke, single-cylinder, SOHC (Single Overhead Camshaft), air-cooled

Displacement:

Approximately 347cc (exact displacement may vary slightly by specific model year, often rounded to 350).

Bore X Stroke:

Typically around 81.0 mm x 67.0 mm (specifications may vary slightly).

Compression Ratio:

Around 9.5:1 to 10.0:1 (varies by year).

Valve Train:

SOHC, 2 valves per cylinder.

Horsepower:

Estimated 27-30 HP at peak RPM (actual figures vary by year and dyno testing).

Torque:

Estimated 20-24 lb-ft at peak RPM (actual figures vary by year).

Redline:

Around 7,500 - 8,000 RPM (refer to manual for exact specifications).

Carburetor Type:

Mikuni VM Series (e.g., VM34SS or similar) single carburetor.

Fuel Type:

Unleaded gasoline, 87 octane (minimum) recommended.

Oil Type:

Motorcycle-specific 4-stroke engine oil, API SG or higher, JASO MA certified. Viscosity typically 10W-40 or 20W-50 depending on ambient temperature.

Oil Capacity:

Approximately 1.4 - 1.6 Liters (refer to manual for exact capacity with filter change).

🔧 Transmission

Type:

Constant mesh, 5-speed sequential gearbox.

Optional Transmissions:

N/A (Only standard 5-speed offered).

Clutch Type:

Wet, multi-plate clutch, cable-operated.

Final Drive:

Chain drive (DID or RK type chains commonly used).

Transmission Oil:

Separate transmission oil is not typically specified; it shares oil with the engine crankcase.

📐 Dimensions

Length:

Approx. 2,170 mm (85.4 in)

Width:

Approx. 815 mm (32.1 in)

Height:

Approx. 1,230 mm (48.4 in)

Wheelbase:

Approx. 1,410 mm (55.5 in)

Ground Clearance:

Approx. 295 mm (11.6 in)

Dry Weight:

Approx. 126 kg (278 lbs)

Wet Weight:

Approx. 135-140 kg (298-309 lbs) with fluids

Fuel Capacity:

Approx. 10 Liters (2.6 US gallons)

Front Tire Size:

80/100-21

Rear Tire Size:

110/100-18

Wheel Type:

Spoked wheels

🛡️ Safety Features

Safety Certifications:

N/A (As a motorcycle, subject to national road regulations, not crash test ratings like cars).

Braking System:

Hydraulic disc brakes front and rear for effective stopping power.

Suspension Stability:

Long-travel suspension designed for off-road stability and bump absorption.

Lighting:

Headlight, taillight, brake light, and turn signals for visibility.

Chassis Strength:

Steel frame construction for durability.

💡 Technology Features

Infotainment Systems:

N/A (Basic instrumentation: speedometer, odometer, trip meter, neutral indicator, high beam indicator).

Electronic Aids:

N/A (No electronic rider aids such as ABS or traction control).

🔧 Maintenance

Engine Oil Change:

Every 3,000 km (1,800 miles) or 6 months.

Oil Filter Replacement:

Every 6,000 km (3,600 miles) or 12 months (or with every second oil change).

Spark Plug Inspection:

Every 3,000 km (1,800 miles).

Air Filter Cleaning:

Every 1,500 km (900 miles) or more frequently in dusty conditions.

Chain Lubrication Adjustment:

Every 500 km (300 miles) and visual inspection before each ride.

Valve Clearance Check:

Every 10,000 km (6,000 miles) or 12 months.

Brake Fluid:

DOT 3 or DOT 4 specification hydraulic brake fluid (refer to manual for exact type).

Fork Oil:

Yamaha Fork Oil (YFO) type 10 or equivalent SAE 10W fork oil. Capacity: ~380 ml per fork leg (refer to manual for exact amount).

Common Wear Items:

Clutch plates, chain and sprockets, fork seals, wheel bearings, steering head bearings.

Carburetor Performance:

Can be prone to clogging if fuel is left sitting for extended periods; requires periodic cleaning and adjustment.

Electrical Connections:

Corrosion on electrical connectors can occur due to exposure to elements, requiring inspection and dielectric grease application.

Suspension Seals:

Fork seals are a common wear item and may require replacement due to age or off-road use.

📚 Vehicle History

Yamaha Legacy:

Yamaha Motor Company has a long history of producing high-performance motorcycles, known for innovation in engine technology and racing success.

Tt Series Context:

The TT series represents Yamaha's dedication to off-road and dual-sport motorcycles, building upon successful motocross (YZ) and enduro platforms.

Tt350 Development:

The TT-350 was developed as a more accessible and user-friendly dual-sport option, bridging the gap between pure dirt bikes and larger street-oriented dual sports.

Production Run:

Produced from the mid-1980s through the early 2000s, indicating a strong market presence and customer satisfaction.

Manufacturing Origin:

Primarily manufactured in Japan.

🏆 Awards & Recognition

Model Awards:

While specific awards for the TT-350 are not widely documented, the model was well-regarded in its segment for its reliability and capability by motorcycle publications of its era.

Customer Satisfaction:

Generally high customer satisfaction due to Yamaha's reputation for build quality and engine durability.

Emissions Standards:

Compliant with emissions standards applicable to its production years in various markets. Manual may contain specific emissions-related testing or adjustment procedures.