Category:
Lightweight Off-Road Motorcycle / Trail Bike
Competitors:
Honda CRF100F/125F, Kawasaki KLX125, Suzuki DR-Z125
Target Audience:
Beginner to intermediate riders, youth riders, trail riding enthusiasts.
Design Philosophy:
User-friendly, reliable, and capable trail performance with Yamaha's renowned engineering.
Systems Covered:
Engine, Transmission, Fuel System, Ignition System, Chassis, Suspension, Brakes, Electrical System, Cooling System, Lubrication System, Frame, Bodywork, Wheels, Tires, Troubleshooting, Maintenance
Page Count:
Estimated 300-400 pages (typical for this model and era of service manual)
Manual Type:
Service Repair Manual
Format:
Digital (Instant Download)
Engine Mechanical:
Comprehensive coverage of internal engine components, including cylinder head, valves, piston, crankshaft, connecting rod, timing system, and lubrication.
Fuel System:
Detailed instructions for carburetor disassembly, cleaning, adjustment, and troubleshooting, including jetting information and float bowl setup.
Ignition System:
Information on the CDI ignition system, spark plug specifications, ignition timing, and troubleshooting ignition failures.
Transmission And Clutch:
Procedures for clutch inspection, adjustment, and replacement, as well as internal transmission inspection and maintenance for the 5-speed gearbox.
Suspension And Steering:
Front fork service (oil changes, seal replacement), rear shock absorber inspection, and steering stem bearing maintenance and adjustment.
Brake System:
Front and rear brake caliper service, pad replacement, brake fluid bleeding, and master cylinder inspection.
Electrical System:
Wiring diagrams, troubleshooting guides for lighting, charging system (stator, regulator/rectifier), and starter system components.
Chassis And Frame:
Information on frame inspection, swingarm pivot maintenance, and general chassis component inspection.
Preventative Maintenance:
Scheduled maintenance intervals for oil changes, air filter cleaning, chain adjustment, and general inspection points.
Troubleshooting:
Diagnostic procedures and flowcharts for common starting, running, and electrical issues.
Rebuild Procedures:
Detailed step-by-step instructions for engine, carburetor, and brake system rebuilds.
Disassembly Reassembly:
Comprehensive guides for removing and reinstalling all major components and sub-assemblies.
Depth:
Professional-level repair and diagnostics, suitable for home mechanics and dealership technicians.
File Type:
Likely PDF (Portable Document Format)
Image Resolution:
Typically high resolution for clear diagrams and text, optimized for printing.
Binding:
N/A (Digital Download - no physical binding)
Paper Type:
N/A (Digital Download - no physical paper)
Length:
Approx. 73.6 inches (1870 mm)
Width:
Approx. 31.3 inches (795 mm)
Height:
Approx. 44.1 inches (1120 mm)
Wheelbase:
Approx. 50.2 inches (1275 mm) for TT-R125LW, shorter for TT-R125L
Dry Weight:
Approx. 185 lbs (84 kg) for TT-R125LW
Fuel Capacity:
Approx. 1.6 gallons (6.0 L)
Seat Height:
Approx. 31.7 inches (805 mm) for TT-R125LW, lower for TT-R125L
Crash Test Data:
N/A (Off-road motorcycle, not subjected to automotive crash testing standards)
Braking System:
Front: Disc brake, Rear: Drum brake (or Disc brake on some variants/years, manual will specify)
Lighting:
Headlight, taillight/brake light
Engine Oil Change:
Every 600 miles or 6 months, or more frequently with hard use (refer to manual for specifics).
Air Filter Cleaning:
Every 300 miles or as needed based on conditions.
Chain Lubrication Adjustment:
Every 300 miles.
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-30 or 20W-40 API SG, JASO MA certified motorcycle oil).
Fork Oil Type:
Specific weight and quantity for front forks will be detailed in the manual (typically 5W or 10W).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Carburetor Clogging:
Common with small displacement bikes; regular cleaning and proper fuel storage can mitigate.
Cam Chain Noise:
Some instances of cam chain tensioner wear can occur over time; manual will detail inspection and replacement.
Suspension Seals:
Like any dirt bike, fork and shock seals can wear; manual provides replacement procedures.
Yamaha Offroad Legacy:
Yamaha has a long and successful history in off-road motorcycling, known for durability and performance in their YZ and TT-R lines.
Tt R Line Introduction:
The TT-R125 was introduced as a capable trail bike designed to fill the gap for youth and beginner riders transitioning to larger displacement motorcycles.
Lw Variant:
The 'LW' designation typically signifies a longer swingarm and larger front wheel (21-inch vs. 19-inch), offering improved off-road capability and higher seat height for taller riders.
Production Period:
The TT-R125 platform was produced from 1999 through 2007.
