🏷️ Basic Information

Make:

Yamaha

Model:

TTR90 / TT-R90

Model Years Covered:

2005 (with compatibility for similar years)

Chassis Codes:

Likely 4GX, but confirm specific year documentation

Engine Codes:

Likely 20C, but confirm specific year documentation

👋 Introduction

Vehicle Segment:

Entry-level off-road/dirt bike, youth motocross

Key Competitors:

Honda CRF70/CRF80, Kawasaki KX85 (though TTR90 is smaller), Suzuki JR80

Target Audience:

Beginner riders, youth, individuals seeking a lightweight and manageable off-road experience

Design Philosophy:

Simplicity, ease of use, durability, approachable performance for learning

📋 Manual Details

Scope:

Comprehensive service, repair, and workshop information

Estimated Pages:

Estimated 150-250 pages (typical for this model's service manuals)

Type:

Service Repair Workshop Manual

Language:

English

Format:

Digital (likely PDF), potentially printable

📖 Manual Coverage

Powertrain:

Engine, transmission, drivetrain

Chassis:

Frame, suspension (front and rear), steering, wheels, brakes

Electrical:

Ignition system, lighting, charging system, wiring diagrams, starter system

Fuel System:

Carburetor, fuel lines, fuel tank, fuel filter

Cooling System:

Air-cooled engine management

Exhaust System:

Exhaust pipe, muffler

Bodywork And Trim:

Body panels, seat, fenders, handlebars

Routine Maintenance:

Oil changes, filter replacements, chain adjustment, spark plug service, air filter cleaning/replacement

Troubleshooting:

Diagnostic procedures for common performance issues, starting problems, electrical faults

Major Repairs:

Engine overhaul, transmission rebuild, carburetor tuning and overhaul, brake system repair, suspension component replacement

Disassembly And Assembly:

Step-by-step instructions for component removal and installation

Diagnostic Capabilities:

Covers basic diagnostic checks and specific troubleshooting flowcharts

Rebuild Specifications:

Includes detailed specifications for engine and transmission component clearances, torque values, and tolerances for complete rebuilds

Electrical Schematics:

Comprehensive wiring diagrams for all electrical systems

📊 Manual Specifications

Digital Format:

PDF

Searchability:

Likely text-searchable PDF for efficient information retrieval

Visual Aids:

Includes diagrams, illustrations, and photographs for clarity

Physical Manual Binding:

N/A (Digital)

Physical Manual Paper:

N/A (Digital)

⚙️ Engine Specifications

Engine Type:

Four-stroke, SOHC, air-cooled

Displacement:

88 cc

Bore X Stroke:

50 mm x 45.6 mm

Compression Ratio:

9.5:1 (typical for this era, confirm specific manual)

Horsepower Estimate:

Approximately 6-8 HP (estimated, not officially published for this class)

Torque Estimate:

Approximately 5-7 Nm (estimated)

Carburetor Type:

Mikuni VM17 (typical, confirm specific manual)

Fuel Delivery:

Carbureted, gravity feed

Ignition System:

CDI (Capacitor Discharge Ignition)

Oil Type:

Yamalube 4 (or equivalent SAE 10W-30 API SE or higher motorcycle oil)

🔧 Transmission

Transmission Type:

Automatic (Centrifugal clutch with 3-speed gearbox)

Clutch Type:

Wet, centrifugal, automatic

Final Drive:

Chain drive

📐 Dimensions

Length:

Approx. 1505 mm (59.3 in)

Width:

Approx. 660 mm (26.0 in)

Height:

Approx. 905 mm (35.6 in)

Wheelbase:

Approx. 1085 mm (42.7 in)

Ground Clearance:

Approx. 175 mm (6.9 in)

Dry Weight:

Approx. 70 kg (154 lbs)

Fuel Tank Capacity:

Approx. 3.5 L (0.9 US gal)

Front Tire Size:

2.50-10 4PR

Rear Tire Size:

3.00-10 4PR

Front Suspension Travel:

Approx. 110 mm (4.3 in) telescopic forks

Rear Suspension Travel:

Approx. 120 mm (4.7 in) swingarm with single shock

🛡️ Safety Features

Safety Ratings:

N/A (Dirt bike segment not typically subject to consumer safety ratings like automobiles)

Braking System Front:

Drum brake

Braking System Rear:

Drum brake

Throttle Limiter:

Often includes a throttle stop screw for speed control for beginner riders

💡 Technology Features

Display Features:

Basic analogue speedometer and odometer are standard on most models; no advanced infotainment.

🔧 Maintenance

Engine Oil Change:

Every 1000 km or 6 months (refer to manual for specific conditions)

Air Filter Cleaning:

Every 500 km or 3 months, or more frequently in dusty conditions

Spark Plug Check Gap:

Every 1000 km or 6 months

Chain Lubrication Adjustment:

Every 200 km or before long rides, adjust slack as per manual specs

Engine Oil Capacity:

Approx. 0.8 L (0.85 US qt) without filter change; 0.9 L (0.95 US qt) with filter change

Transmission Oil Type:

Same as engine oil (Yamalube 4 or equivalent SAE 10W-30)

Carburetor Fouling:

Common in small displacement engines with infrequent use, requiring cleaning and adjustment.

Chain Wear:

Regular adjustment and lubrication are crucial to prevent premature wear and potential derailment.

Air Filter Clogging:

Rapid clogging in dusty environments can affect engine performance and longevity.

Oil Filter Part Number:

Refer to manual for exact part number (typically an internal screen on this model, not a spin-on filter).

Air Filter Part Number:

Refer to manual for exact part number (e.g., 5FK-14451-00-00 or equivalent).

Spark Plug Part Number:

NGK CR7E or equivalent

📚 Vehicle History

Yamaha Motorcycles:

Yamaha Motor Corporation is a Japanese manufacturer with a long history in motorcycles, known for innovation and performance across various disciplines.

Ttr Series Overview:

The TTR line represents Yamaha's range of off-road recreational and competition motorcycles, known for their usability and reliability. The TTR90 is a smaller displacement model within this popular series.

Manufacturing Origin:

Likely Japan or Southeast Asia, typical for Yamaha production

🏆 Awards & Recognition

Industry Acclaim:

While the TTR90 itself may not have specific 'awards,' the TTR series is widely recognized for its accessibility and popularity in the youth motocross segment.