Segment:
Entry-level to intermediate off-road/trail motorcycle.
Target Audience:
Beginner riders, youth riders, and recreational trail riders.
Competitors:
Honda CRF100F/CRF125F, Kawasaki KLX125/KLX140, Suzuki DR-Z125.
Engine Type:
Reliable, air-cooled SOHC four-stroke engine.
Transmission:
Smooth-shifting 5-speed gearbox.
Suspension:
Long-travel telescopic front forks and Monocross rear suspension for capable off-road handling.
Electric Start Option:
Available on the TT-R125E model for user convenience.
Build Quality:
Yamaha's reputation for durable and well-engineered off-road motorcycles.
Engine System:
Detailed breakdown of the 124cc air-cooled 4-stroke engine, including disassembly, assembly, timing, and component specifications.
Fuel System:
Carburetor (Mikuni VM17) inspection, adjustment, cleaning, and overhaul procedures.
Ignition System:
CDI ignition system testing, troubleshooting, and component specifications.
Transmission System:
5-speed constant mesh gearbox, clutch operation, adjustment, and internal component service.
Chassis System:
Frame inspection, front fork disassembly, servicing, and rear shock absorber details.
Braking System:
Front and rear drum brake servicing, adjustment, and component replacement.
Electrical System:
Wiring diagrams, lighting system, battery maintenance, and starter motor (for TT-R125E) troubleshooting.
Cooling System:
Air-cooled system specifications and maintenance.
Routine Maintenance:
Oil changes, filter replacement, spark plug checks, chain adjustment, and general inspection procedures.
Engine Repair:
Top-end rebuilds (cylinder, piston, rings), valve adjustments, timing chain replacement, and crankshaft seal inspection.
Transmission Repair:
Clutch plate replacement, gearbox component inspection, and shift drum servicing.
Suspension Overhaul:
Front fork seal replacement, oil replenishment, and rear shock absorber servicing.
Troubleshooting:
Diagnostic flowcharts and common problem identification for engine, electrical, and mechanical systems.
Wiring Diagrams:
Detailed electrical schematics for easy troubleshooting and repair of the electrical system.
Depth:
Comprehensive, suitable for dealership technicians and advanced DIY mechanics. Covers complete disassembly, overhaul, and reassembly of major components.
Engine Type:
124cc, Air-cooled, 4-stroke, SOHC, 2-valve
Bore X Stroke:
54.0 mm x 54.5 mm
Spark Plug Gap:
0.6 - 0.7 mm (0.024 - 0.028 in)
Valve Clearance Intake Cold:
0.04 - 0.08 mm (0.002 - 0.003 in)
Valve Clearance Exhaust Cold:
0.08 - 0.12 mm (0.003 - 0.005 in)
Estimated Horsepower:
Approx. 10-12 HP (exact figures not officially published for this model)
Estimated Torque:
Approx. 7-8 lb-ft (exact figures not officially published for this model)
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
5.1 L (1.3 US gal)
Type:
5-speed constant mesh
Clutch Type:
Wet, multiple-disc
Gear Ratios:
1st: 2.833, 2nd: 1.875, 3rd: 1.381, 4th: 1.130, 5th: 0.917
Final Drive:
O-ring sealed chain
Transmission Fluid Type:
Yamalube 4 (or equivalent SAE 10W-30 API SG or higher)
Transmission Fluid Capacity:
0.65 L (0.69 US qt)
Engine Oil Change:
Every 1,000 km (600 miles) or 6 months, whichever comes first. (Check manual for specific conditions)
Oil Filter Replacement:
Replace engine oil filter at every second oil change or as specified.
Spark Plug Check:
Every 1,000 km (600 miles).
Valve Clearance Check:
Every 4,000 km (2,500 miles) or 2 years.
Chain Lubrication And Adjustment:
Every 500 km (300 miles) or after riding in wet conditions.
Engine Oil:
Yamalube 4 (or equivalent SAE 10W-30 API SG or higher)
Engine Oil Capacity:
0.90 L (0.95 US qt) without filter change, 0.95 L (1.0 US qt) with filter change.
Brake Fluid:
DOT 3 or DOT 4 brake fluid (for brake system, if applicable in later models or specific variants).
Carburetor Tuning:
Can be sensitive to altitude and temperature; periodic cleaning and adjustment may be needed for optimal performance.
Suspension Wear:
As with many off-road bikes, fork seals and shock bushings can wear over time, leading to leaks or reduced damping performance.
Chain And Sprockets:
Regular maintenance is crucial to prevent premature wear of the drive chain and sprockets.
Electric Start System:
For TT-R125E, battery maintenance and starter motor connections are important to ensure reliable starting.
Manufacturer Origin:
Japan
Yamaha Motorcycle Division:
Yamaha Motor Company is a long-standing and respected manufacturer of motorcycles and powersports vehicles.
Tt-R Series:
The TT-R series is Yamaha's line of recreational off-road motorcycles, known for their reliability and ease of use. The 125cc displacement makes it a popular choice for younger or less experienced riders.
Introduction Year:
The TT-R125 model line was introduced in 1999.
Manufacturing Location:
Likely Japan or Southeast Asia (specific plant details not readily available).
