Category:
Off-road, trail, youth motocross motorcycle
Target User:
Entry-level riders, youth riders, recreational trail riders
Competitors:
Honda CRF100F/CRF125F, Kawasaki KLX125, Suzuki DR-Z125
Engine Type:
Air-cooled, SOHC, 4-stroke
Suspension:
Long-travel front forks and rear monoshock (especially the LW variant).
Reliability:
Known for Yamaha's robust and reliable 4-stroke engine design.
Engine:
Full engine overhaul, tuning, carburetor, ignition system, lubrication, cooling (air-cooled), valve clearance adjustment.
Transmission:
Clutch, gearbox inspection and repair, shift mechanism, lubrication.
Chassis:
Frame, subframe, suspension (front forks, rear shock), swingarm, steering system, wheel bearings.
Brakes:
Front and rear brake systems (drum/disc depending on specific TT-R125 variant), brake fluid, master cylinders, calipers, linkage.
Electrical:
Wiring diagrams, lighting system, ignition system, battery, charging system, fuses, troubleshooting electrical faults.
Fuel System:
Carburetor disassembly, cleaning, adjustment, fuel lines, petcock.
Exhaust System:
Exhaust pipe, muffler inspection and maintenance.
Bodywork:
Body panels, seat, fuel tank, fenders, decals, general assembly/disassembly.
Maintenance:
Scheduled maintenance intervals, oil changes, filter replacements, lubrication points, chain adjustment, spark plug replacement.
Troubleshooting:
Diagnostic charts and procedures for common running issues, electrical problems, and mechanical failures.
Repair:
Detailed step-by-step instructions for component removal, inspection, repair, and reassembly.
Rebuilds:
Engine, carburetor, and suspension component rebuild procedures.
Adjustments:
Carburetor jetting, ignition timing, clutch play, brake free play, suspension sag.
Depth:
In-depth technical information suitable for professional mechanics and advanced DIY enthusiasts.
Diagnostics:
Comprehensive diagnostic procedures for identifying and rectifying faults across all vehicle systems.
Specifications:
Detailed torque values, clearances, fluid capacities, and technical specifications for all components.
Engine Type:
Air-cooled, 4-stroke, SOHC, 2-valve
Bore X Stroke:
54.0 mm x 54.5 mm (typical for this engine family)
Compression Ratio:
Approximately 10.5:1
Horsepower:
Estimated 11-13 HP (at crankshaft)
Torque:
Estimated 7-8 lb-ft (at crankshaft)
Carburetor Type:
Mikuni VM Series (e.g., VM20) or similar
Fuel Type:
Unleaded gasoline
Ignition System:
CDI (Capacitor Discharge Ignition)
Lubrication Type:
Wet sump
Oil Capacity:
Approx. 0.9 - 1.0 Liters
Crash Safety Ratings:
N/A (Motorcycle, not subject to automotive crash testing standards)
Braking System:
Front disc brake, rear drum brake (standard on TT-R125); some LW variants might have rear disc. Manual covers both.
Lighting:
Headlight, taillight/stoplight, front/rear reflectors.
Oil Change Interval:
Every 600 miles or 3 months (typical Yamaha recommendation, consult manual for exact specification).
Air Filter Cleaning:
Every 10-15 hours of use or monthly (typical).
Spark Plug Inspection:
Every 600 miles or annually.
Valve Clearance Check:
Every 2000 miles or annually (critical for 4-stroke engine health).
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-30, API SE, SF, SG, SH, SJ or higher)
Brake Fluid Type:
DOT 3 or DOT 4 (for hydraulic brakes, if equipped).
Chain Lube:
Specific motorcycle chain lubricant recommended.
Carburetor Clogging:
Common with infrequent use or poor fuel quality, leading to starting issues or poor running. Manual covers cleaning and tuning.
Suspension Seals:
Potential for front fork seal leaks over time, especially under hard use. Manual details fork maintenance.
Valve Adjustment Necessity:
Valves can tighten with use; regular adjustment as per schedule is key to engine longevity. Manual provides precise procedures.
Yamaha Off Road:
Yamaha has a long-standing reputation in off-road motorcycling, known for performance and durability, particularly with its TT-R and YZ lines.
Tt-R Series:
The TT-R line was developed to offer reliable, user-friendly off-road performance, bridging the gap between beginner bikes and full-blown motocrossers. The 125cc engine has been a staple for youth and trail riding.
Manufacturing Location:
Likely manufactured in Japan or Asia by Yamaha Motor Company.
Model Years:
The TT-R125 was introduced in the early 2000s and has seen continuous updates and variations (like the LW - Long Wheelbase) through subsequent model years.
