🏷️ Basic Information

Make:

Yamaha

Model:

TT350

Year:

1986-1987

Model Code:

Likely 3TB (1986), 3SW (1987) - Exact codes may vary by region and require cross-referencing within the manual.

Vehicle Type:

Dual-Sport Motorcycle

👋 Introduction

Market Position:

The Yamaha TT350 was a popular dual-sport motorcycle designed for versatility, appealing to riders who sought off-road capability combined with street legality for commuting and trailering.

Competitive Analysis:

Competed with other dual-sport offerings of the era, such as the Honda XR350R and Suzuki DR350, often praised for its torquey engine and balanced chassis.

Key Features:

Air-cooled, four-stroke engine; robust chassis; capable suspension for off-road use; electric start on some models (verify specific year/market); reliable Yamaha build quality.

📋 Manual Details

Coverage Areas:

Comprehensive: All mechanical and electrical systems, maintenance, troubleshooting, repairs, specifications, wiring diagrams.

Page Count:

Estimated 300-500+ pages (typical for comprehensive service manuals of this era).

Manual Type:

Service Manual / Repair Manual / Workshop Manual

Language:

English (Standard for Yamaha North American Market manuals)

Format:

PDF (Download)

Accessibility:

Searchable text within PDF for quick information retrieval.

📖 Manual Coverage

Systems Covered:

Engine, Fuel System, Ignition System, Lubrication System, Cooling System (if applicable), Transmission, Clutch, Drivetrain, Chassis, Suspension (Front & Rear), Brakes (Front & Rear), Electrical System, Lighting System, Wiring Diagrams, Frame, Bodywork.

Procedures Included:

Routine Maintenance, Engine Disassembly & Reassembly, Carburetor Tuning & Overhaul, Suspension Servicing, Brake System Maintenance & Bleeding, Electrical System Diagnostics, Troubleshooting Guides, Component Replacement, Torque Specifications, Valve Clearance Adjustment, Lubrication Points, Wheel Bearing Servicing, Drive Chain Adjustment.

Technical Depth:

In-depth: Suitable for professional mechanics and experienced DIY enthusiasts. Covers full rebuilds, complex diagnostics, and precise adjustments.

Troubleshooting:

Extensive troubleshooting guides for common problems, categorized by system (e.g., starting issues, running problems, electrical faults) with diagnostic trees.

Parts Information:

Includes detailed exploded diagrams of all major components, facilitating identification of part numbers for ordering.

Wiring Diagrams:

Complete and detailed electrical wiring diagrams, essential for diagnosing and repairing electrical system issues.

Specifications Tables:

Comprehensive tables of all technical specifications, including dimensions, weights, performance figures, fluid capacities, and more.

📊 Manual Specifications

File Format:

PDF

Print Quality:

High Resolution Scan (typically aiming for clear text and legible diagrams).

Binding Type:

N/A (Digital PDF)

Paper Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine:

347cc, Air-cooled, Four-stroke, SOHC, Single Cylinder

Horsepower:

Estimated 25-30 HP (at crankshaft, actual may vary by tuning and exhaust).

Torque:

Estimated 20-24 lb-ft (at crankshaft, actual may vary).

Fuel System:

Carburetor: Typically a single Mikuni VM34SS or similar.

Ignition System:

CDI (Capacitor Discharge Ignition)

Cooling System:

Air-cooled

Bore X Stroke:

Approximately 80.0 mm x 69.5 mm (verify within manual).

Compression Ratio:

Approximately 9.5:1 (verify within manual).

Valve Train:

SOHC (Single Overhead Camshaft)

Oil Capacity:

Typically around 1.7-1.9 Liters (with filter change). Exact specification in manual.

Carburetor Details:

Specific jetting, needle positions, float height, and adjustment procedures for the factory carburetor.

🔧 Transmission

Standard:

5-Speed Manual Transmission

Optional:

N/A

Features:

Constant mesh, sequential gears.

Clutch:

Wet, multi-plate, cable-actuated

Final Drive:

Chain Drive

Gear Ratios:

Detailed primary gear ratio and individual gear ratios for each of the 5 speeds, as well as the final drive ratio. (Specifics to be found in manual).

📐 Dimensions

Overall Length:

Approximately 2155 mm (84.8 in) (verify within manual).

Overall Width:

Approximately 820 mm (32.3 in) (verify within manual).

Overall Height:

Approximately 1230 mm (48.4 in) (verify within manual).

Dry Weight:

Approximately 128 kg (282 lbs) (verify within manual).

Wet Weight:

Approximately 138 kg (304 lbs) (estimate, including fluids).

Ground Clearance:

Approximately 280 mm (11.0 in) (verify within manual).

Seat Height:

Approximately 860 mm (33.9 in) (verify within manual).

Cargo Capacity:

N/A (Motorcycle)

Wheelbase:

Approximately 1400 mm (55.1 in) (verify within manual).

Fuel Capacity:

Approximately 10.0 Liters (2.6 US gal) (verify within manual).

🛡️ Safety Features

Ratings:

N/A (Motorcycle safety is assessed differently than automobiles; focus is on handling, braking, and stability).

Active Features:

Disc Brakes (Front & Rear), Knobby Tires for Off-Road Traction, Stable Chassis Design.

Passive Features:

Durable Frame Construction, Integrated Lighting System.

💡 Technology Features

Infotainment:

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

Driver Assistance:

N/A (Motorcycle, no electronic driver assistance systems).

Connectivity:

N/A (No electronic connectivity features).

🔧 Maintenance

Oil Change Interval:

Every 3,000 km (1,860 miles) or 6 months, whichever comes first. (Verify exact interval in manual).

Air Filter Cleaning:

Every 1,000 km (620 miles) or as needed, depending on conditions. (Verify in manual).

Valve Clearance Check:

Every 6,000 km (3,720 miles) or 12 months. (Verify in manual).

Spark Plug Replacement:

Every 6,000 km (3,720 miles). (Verify in manual).

Engine Oil Type:

Yamalube 4 (or equivalent SAE 20W-40, API SE or SF). Consult manual for precise viscosity and API rating.

Brake Fluid Type:

DOT 3 (or DOT 4 for some applications). Consult manual for exact specification.

Coolant Type:

N/A (Air-cooled engine)

Fork Oil Type:

Yamalube Fork Oil (or equivalent SAE 10W). Consult manual for quantity and specific type.

Known Issues:

Carburetor gumming if not run regularly, potential starter clutch issues on electric start models, worn suspension components due to age and use, occasional CDI box failures.

Torque Values:

Comprehensive torque specifications for all critical fasteners (e.g., cylinder head bolts, crankshaft nuts, wheel axles) are detailed in the manual.

Tune Up Procedures:

Detailed procedures for carburetor synchronization, ignition timing checks (if applicable), and engine performance adjustments.

Tire Pressure Front:

150 kPa (1.50 kgf/cm², 22 psi) (verify in manual).

Tire Pressure Rear:

175 kPa (1.75 kgf/cm², 25 psi) (verify in manual).

📚 Vehicle History

Brand Heritage:

Yamaha has a long and storied history in motorcycle manufacturing, particularly in off-road and dual-sport segments, building a reputation for reliability and performance.

Model Evolution:

The TT350 was part of Yamaha's evolving line of four-stroke dual-sport bikes, building on previous displacements and designs, and preceding later models with further technological advancements.

Production Years:

Mid-to-late 1980s. Specific production run for TT350 was limited to a few years, including 1986-1987.

Manufacturing Location:

Japan (Primary manufacturing location for Yamaha motorcycles).

🏆 Awards & Recognition

Recognitions:

The TT350 was generally well-regarded for its performance and reliability in its class during its production years, often earning positive reviews in motorcycle publications of the era.

Ratings:

Likely received favorable ratings for handling and engine character from contemporary motorcycle magazines.

Certifications:

N/A (Motorcycles do not undergo formal safety certifications in the same manner as automobiles).