🏷️ Basic Information

Make:

Yamaha

Model:

TT-R125

Year:

2008

Internal Model Code:

TT-R125E / TT-R125L

👋 Introduction

Segment:

Entry-level off-road/trail motorcycle, popular for youth and recreational riders.

Competitors:

Honda CRF100F/CRF150F, Kawasaki KLX125/KLX140, Suzuki DR-Z125.

Design Philosophy:

Durable, user-friendly, reliable performance for trail riding and learning off-road techniques.

Variants:

Likely includes kick-start (TT-R125) and potentially electric-start (TT-R125E/L) versions, with differences in suspension or wheel sizes between 'E' and 'L' models.

📋 Manual Details

Sections Covered:

Engine, Fuel System, Carburetion, Ignition, Lubrication, Cooling System, Chassis, Suspension (Front & Rear), Wheels, Tires, Brakes (Front & Rear), Electrical System, Lighting, Troubleshooting, Specifications, Maintenance, Adjustments, Wiring Diagrams

Estimated Page Count:

300-400

Type:

Service Repair Workshop Manual

Language:

English

Format:

Digital Download (PDF)

📖 Manual Coverage

Engine Mechanical:

Complete engine overhaul, piston, rings, cylinder, valve timing, camshaft, crankshaft, connecting rod, bearings, seals, gaskets.

Fuel System:

Carburetor disassembly, cleaning, adjustment, fuel tank, fuel lines, fuel filter replacement.

Ignition System:

CDI unit, ignition coil, spark plug, ignition timing checks and adjustments.

Transmission:

Clutch operation, transmission disassembly and reassembly, gear inspection, shift mechanism.

Suspension Steering:

Front fork disassembly, service, and adjustment (preload, damping where applicable). Rear shock absorber inspection and replacement. Steering stem bearings.

Brakes:

Front and rear brake system inspection, pad replacement, caliper service, brake fluid bleeding and replacement, master cylinder.

Electrical Lighting:

Wiring diagrams, battery maintenance, charging system (stator, rectifier/regulator), lighting system (headlight, taillight, turn signals if equipped), horn.

Scheduled Maintenance:

Oil changes, filter replacement, chain adjustment and lubrication, air filter cleaning/replacement, spark plug checks and replacement, brake checks, tire pressure.

Troubleshooting:

Diagnostic charts for common performance issues, starting problems, electrical faults, and drivability concerns.

Repair Disassembly:

Detailed step-by-step procedures for disassembling, inspecting, repairing, and reassembling all major vehicle components.

Adjustments:

Carburetor jetting, idle speed, clutch lever free play, throttle cable free play, chain slack, suspension settings.

Wiring Diagrams:

Includes detailed, color-coded wiring diagrams for easy electrical system diagnosis and repair.

Depth:

Comprehensive from basic rider maintenance to complete engine and transmission rebuilds, including electrical diagnostics.

Diagnostic Codes:

Troubleshooting sections often include symptom-based diagnostics and potential causes, aiding in quick issue identification.

📊 Manual Specifications

File Type:

PDF

Quality:

High-resolution scans ensuring clarity of text and illustrations.

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

Coverage:

This is a complete service and repair manual, providing all necessary information for maintenance, troubleshooting, and repairs.

Text Search:

PDF format allows for keyword searching of specific terms, procedures, or parts.

⚙️ Engine Specifications

Type:

4-stroke, SOHC, 2-valve, Air-cooled

Displacement:

124cc

Bore X Stroke:

54.0 mm x 54.5 mm

Compression Ratio:

9.5:1

Horsepower:

Approx. 10-12 HP (Estimates vary based on source and specific dyno runs)

Torque:

Approx. 7-8 lb-ft (Estimates vary)

Carburetor:

Mikuni VM20SS (or similar 20mm constant velocity carburetor)

Fuel Type:

Unleaded gasoline

Oil Capacity:

Approx. 0.9 L (0.95 US qt) without filter change, 1.0 L (1.05 US qt) with filter change.

Oil Type:

Yamalube 4 (or equivalent SAE 10W-40 API SG or higher, JASO MA)

🔧 Transmission

Type:

5-speed constant mesh

Transmission Variants:

N/A (Standard 5-speed)

Clutch:

Wet, multi-plate

Final Drive:

O-ring sealed chain

📐 Dimensions

Length:

Approx. 1835 mm (72.2 in) for TT-R125L, slightly less for TT-R125E

Width:

Approx. 825 mm (32.5 in)

Height:

Approx. 1130 mm (44.5 in) for TT-R125L, slightly less for TT-R125E

Wheelbase:

Approx. 1285 mm (50.6 in)

Ground Clearance:

Approx. 285 mm (11.2 in) for TT-R125L, less for TT-R125E

Seat Height:

Approx. 805 mm (31.7 in) for TT-R125L, Approx. 760 mm (29.9 in) for TT-R125E

Wet Weight:

Approx. 100 kg (220 lbs) for TT-R125L, Approx. 97 kg (214 lbs) for TT-R125E

Fuel Capacity:

Approx. 6.0 L (1.6 US gal)

🛡️ Safety Features

Safety Features:

The manual focuses on mechanical safety and proper operation rather than crash ratings. Key safety advice includes proper gear, maintenance, and adherence to trail rules.

Braking System:

Front: Disc Brake; Rear: Drum Brake (typical for this model year and class).

Frame:

Steel diamond frame for rigidity and durability.

💡 Technology Features

Features:

N/A (This is a basic off-road motorcycle, no advanced infotainment systems).

Features:

N/A (No electronic driver assistance features on this model).

Features:

N/A (No connectivity features).

🔧 Maintenance

Engine Oil Change:

Every 1,000 km (600 miles) or 6 months, whichever comes first.

Chain Lubrication Tension:

Every 500 km (300 miles) or after washing/wet riding. Adjust tension as per manual specifications (typically 10-20mm slack).

Air Filter Cleaning:

Every 6,000 km (3,750 miles) or as needed based on riding conditions (more frequently in dusty environments).

Spark Plug Inspection:

Every 6,000 km (3,750 miles).

Valve Clearance Check:

Every 12,000 km (7,500 miles).

Engine Oil Viscosity:

SAE 10W-40

Brake Fluid Type:

DOT 3 or DOT 4.

Common Wear Items:

Clutch plates, brake pads, chain and sprockets, throttle cables, fork seals (typical for off-road use).

Carburetor Cleaning:

Occasional carburetor cleaning may be required due to fuel deposits, especially if the bike sits for extended periods.

Suspension Seals:

Fork seals can be prone to wear and leaks with heavy off-road use, requiring periodic inspection and replacement.

📚 Vehicle History

Yamaha Offroad:

Yamaha has a long and successful history in off-road racing and trail riding, known for durable and capable machines.

Tt-R Lineage:

The TT-R line has consistently offered entry-level to mid-displacement off-road bikes, with the 125cc model being a staple for younger riders or those seeking a nimble trail bike.

Manufacturing Country:

Likely manufactured in Japan or potentially other Yamaha global facilities.

🏆 Awards & Recognition

Awards History:

While specific awards for the 2008 model are not prominently listed, the TT-R series generally receives positive reviews for its reliability, ease of use, and suitability for its target market.