Segment:
Entry-level to intermediate off-road/dirt bike, often used for trail riding, recreational off-roading, and as a beginner's competition machine.
Competitors:
Competes with models like the Honda CRF125F, Kawasaki KLX125, Suzuki DR-Z125, and KTM 125 SX (though the latter is typically a more performance-oriented, 2-stroke model).
Strengths:
Reliable air-cooled engine, user-friendly power delivery, relatively low seat height (especially on 'L' variants), durable construction, accessible maintenance, and good for developing riding skills.
Variants Distinction:
E (Electric Start), L (Longer wheelbase, taller suspension), LE (Electric Start, Longer wheelbase, taller suspension). This manual covers all three, noting specific differences where applicable.
Manual Scope:
Comprehensive service, repair, and maintenance information for the 2006 Yamaha TT-R125E, TT-R125L, and TT-R125LE models.
Estimated Page Count:
Approximately 200-300 pages (typical for this class of service manual).
Type:
Factory Authorized Service Manual / Repair Manual
Format:
Digital (PDF) - Searchable, printable.
Engine:
Complete engine disassembly, assembly, inspection, and repair procedures for the 124cc air-cooled 4-stroke engine. Includes top-end, bottom-end, valve train, cooling system.
Fuel System:
Carburetor (Mikuni VM17 type typically) disassembly, cleaning, adjustment, and troubleshooting. Fuel tank and petcock maintenance.
Transmission:
Clutch operation, adjustment, and replacement. Gearbox internal inspection, repair, and lubrication specifications. Shift mechanism.
Chassis:
Frame inspection and repair. Swingarm and linkage lubrication and bearing checks. Rear shock absorber adjustment and replacement.
Suspension:
Front fork disassembly, inspection, seal replacement, oil type, and level specifications. Rear suspension linkage and shock absorber service.
Brakes:
Front and rear brake system maintenance, including brake pad replacement, caliper service, master cylinder overhaul, brake fluid type, bleeding procedures, and disc inspection.
Electrical System:
Ignition system (CDI), lighting circuits, charging system (stator, regulator/rectifier), battery maintenance, fuse specifications, and wiring diagrams.
Cooling System:
Air-cooling system inspection and component identification (fins, airflow). Specific mentions are for air-cooled engines.
Exhaust System:
Exhaust pipe and muffler inspection, maintenance, and potential repair guidance.
Wheels Tires:
Wheel bearing maintenance, spoke tension adjustment (if applicable to specific variants), tire pressure recommendations, and wheel installation.
Maintenance:
Scheduled maintenance intervals, oil changes, filter replacements, spark plug checks and replacement, chain adjustment, lubrication points.
Troubleshooting:
Systematic diagnostic guides for common issues, including starting problems, performance issues, electrical faults, and braking concerns.
Repair:
Detailed step-by-step repair instructions for all major components and systems, including engine rebuilds, transmission overhauls, and suspension work.
Adjustments:
Carburetor jetting and idle speed adjustments, clutch lever free play, throttle cable free play, brake lever free play, chain slack.
Disassembly Assembly:
Complete breakdown and reassembly instructions for all motorcycle components.
Specifications:
Torque specifications for all fasteners, valve clearances, engine component tolerances, fluid capacities, and electrical resistance values.
Depth:
Factory-level diagnostic and repair procedures, suitable for dealership technicians and experienced DIY mechanics. Covers everything from basic fluid changes to complete engine and transmission rebuilds.
Engine Type:
124cc, Air-Cooled, Four-stroke, SOHC, 2-Valve
Bore X Stroke:
54.0 mm x 54.5 mm
Compression Ratio:
9.5:1 (Typical, may vary slightly)
Horsepower:
Approximately 10-12 HP at 7500-8000 RPM (estimated, depends on specific tuning and variant).
Torque:
Approximately 7-8 lb-ft at 5500-6000 RPM (estimated).
Carburetor:
Mikuni VM17 (typical), Single Downdraft
Ignition System:
CDI (Capacitor Discharge Ignition)
Oil Type:
SAE 10W-40 API SG or higher motorcycle-specific oil.
Engine Oil Capacity:
0.90 Liters (0.95 US qt) without oil filter change; 1.00 Liters (1.05 US qt) with oil filter change.
Overall Length:
Approx. 1800-1850 mm (depending on variant: L/LE are longer)
Overall Width:
Approx. 770-800 mm
Overall Height:
Approx. 1060-1120 mm (depending on variant: L/LE are taller)
Seat Height:
Approx. 775 mm (standard), 810 mm (L/LE variants)
Ground Clearance:
Approx. 280-300 mm (depending on variant)
Dry Weight:
Approx. 80-85 kg (depending on variant: E/L/LE and electric start system)
Wet Weight:
Approx. 85-90 kg (estimated)
Fuel Capacity:
6.0 Liters (1.6 US gal) including reserve
Initial Break In:
First service typically around 600 miles (1000 km) or 6 months, including oil change, filter clean, chain adjustment, and general inspection. Manual will detail specific break-in procedures.
Regular Oil Change:
Every 1000 miles (1600 km) or 6 months. More frequently under severe riding conditions.
Air Filter Cleaning:
Every 600 miles (1000 km), more often in dusty conditions.
Spark Plug Check:
Every 1000 miles (1600 km).
Valve Clearance Check:
Every 1200 miles (2000 km) or as specified in the manual.
Brake Fluid:
DOT 3 or DOT 4 Hydraulic Brake Fluid.
Fork Oil:
Yamaha Suspension Fluid (or equivalent SAE 10W fork oil). Exact quantity and level specified in manual.
Common Wear Items:
Chain and sprockets wear, brake pad wear, fork seal leaks, carburetor gumming if left unused for long periods.
Engine Durability:
Generally robust, but adherence to maintenance schedule is crucial for longevity. Valve adjustments are important for optimal performance and engine health.
Yamaha Legacy:
Yamaha Motor Company, a subsidiary of Yamaha Corporation, has a long-standing reputation for producing high-quality motorcycles, known for innovation and performance across various segments including off-road, sport, and street bikes.
Tt-R Lineage:
The TT-R line represents Yamaha's commitment to the recreational and entry-level dirt bike market. The TT-R125 was introduced as a successor to smaller displacement bikes, offering more power and features suitable for a wider range of riders.
Manufacturing Location:
Typically manufactured in Japan or other Yamaha global production facilities.
