Category:
Entry-level to intermediate off-road/trail motorcycle
Target Audience:
Beginner riders, youth riders, casual trail riders, recreational off-road enthusiasts
Key Competitors 2000:
Honda CRF100F/XR100R, Kawasaki KX100/KLX140, Suzuki DR-Z125
Engine Type:
Air-cooled, SOHC, 4-stroke
Transmission:
5-speed constant mesh
Suspension Type:
Long-travel telescopic front fork, Monocross rear suspension
Wheelbase Variant:
LW designation indicates a longer wheelbase for improved stability
Starter System:
Kickstart
Engine:
Complete Engine Systems, Top End, Bottom End, Carburetion, Lubrication, Cooling
Chassis:
Frame, Swingarm, Suspension (Front and Rear), Steering, Wheels, Tires, Brakes (Front and Rear), Drive Chain
Electrical:
Ignition System, Lighting, Charging System, Wiring Diagrams, Switches, CDI Unit
Bodywork:
Body panels, Seat, Fenders, Fuel Tank, Handlebars, Controls
Estimated Pages:
Approximately 300-400 (typical for comprehensive service manuals of this era)
Type:
Service Repair Manual / Workshop Manual / Shop Guide
Powertrain:
Engine internals, transmission, clutch, lubrication system, fuel delivery (carburetor), exhaust system
Suspension And Steering:
Front fork assembly, rear shock absorber, linkage, steering stem bearings
Braking System:
Front disc brake, rear drum brake, hydraulic lines, brake pads/shoes
Electrical System:
Ignition timing, spark plug specifications, charging system (stator, regulator/rectifier), lighting circuits, battery maintenance
Wheels And Tires:
Spoke tensioning, tire pressure specifications, wheel bearing maintenance
Routine Maintenance:
Oil changes, filter replacement, spark plug checks, chain adjustment, brake adjustments, air filter cleaning/replacement
Troubleshooting:
Diagnostic charts for common problems, electrical fault finding, engine performance issues
Major Repairs:
Engine overhaul (piston, rings, valves), transmission rebuild, carburetor overhaul, suspension fork rebuild
Component Disassembly And Assembly:
Detailed step-by-step instructions for all major components
Diagnostic Capabilities:
Comprehensive diagnostic procedures, including interpretation of symptoms and troubleshooting flowcharts
Specifications And Tolerances:
Detailed torque specifications, clearances, measurements, and critical tolerances for all engine and chassis components
Rebuild Procedures:
Complete instructions for engine, transmission, and suspension component rebuilds, including parts lists and special tool recommendations
Wiring Diagrams:
Detailed, color-coded electrical wiring diagrams for easy troubleshooting and repair of the electrical system
Engine Type:
4-stroke, SOHC, 2-valve, Air-cooled
Displacement:
124cc (Cubic Centimeters)
Bore X Stroke:
54.0 mm x 54.5 mm
Compression Ratio:
9.5:1 (typical for this engine)
Valve Clearance Intake Cold:
0.08 - 0.13 mm
Valve Clearance Exhaust Cold:
0.10 - 0.15 mm
Horsepower:
Approximately 10-12 HP (peak, estimated)
Torque:
Not officially published, but optimized for low-to-mid range grunt
Carburetor Model:
Mikuni VM20SS (typical)
Fuel Type:
Unleaded gasoline
Fuel Tank Capacity:
Approximately 1.6 Gallons (6.0 Liters)
Carburetor Jetting:
Manual will specify main jet, pilot jet, needle position, and air screw settings
Type:
5-speed constant mesh
Gear Ratios:
Manual will provide specific gear ratios for each gear (e.g., 1st: 2.500, 2nd: 1.706, 3rd: 1.333, 4th: 1.045, 5th: 0.875 - typical for this model)
Clutch Type:
Wet multi-disc, manual operation
Clutch Lever Free Play:
2-3 mm (typical)
Transmission Oil Type:
Yamalube 4 (or equivalent SAE 10W-40 API SG or higher motorcycle oil)
Transmission Oil Capacity:
Approximately 0.85 Liters (0.89 US qt)
Overall Length:
Approximately 74.2 inches (1885 mm)
Overall Width:
Approximately 31.3 inches (795 mm)
Overall Height:
Approximately 44.3 inches (1125 mm)
Seat Height:
Approximately 31.5 inches (800 mm)
Wheelbase:
Approximately 50.0 inches (1270 mm) for LW model
Dry Weight:
Approximately 178 lbs (81 kg)
Wet Weight:
Approximately 192 lbs (87 kg) (with all fluids)
Maximum Load:
Not specified, but typically for a single rider
Crash Test Ratings:
N/A (Off-road vehicle, not subject to automotive safety standards)
Braking System:
Hydraulic front disc brake, mechanical rear drum brake
Tire Type:
Knobby tires for off-road traction
Lighting:
Headlight, taillight, brake light
Chassis Design:
Durable steel frame and swingarm for off-road abuse
Display Type:
N/A (Basic instrumentation: speedometer, odometer, neutral indicator, high-beam indicator)
Electronic Aids:
N/A (No ABS, traction control, or other electronic rider aids)
Engine Oil Change:
Every 1,000 km or 6 months, whichever comes first.
Air Filter Cleaning:
Every 1000 km or as needed based on riding conditions (more frequently in dusty environments).
Spark Plug Inspection:
Every 1,000 km.
Chain Lubrication And Adjustment:
Every 500 km or as needed.
Brake Pad Inspection:
Every 1,000 km.
Valve Clearance Check:
Every 4,000 km.
Engine Oil Specification:
Yamalube 4 (or SAE 10W-40 API SG classifying motorcycle oil)
Brake Fluid Type:
DOT 3 or DOT 4 (for hydraulic front brake)
Coolant:
N/A (Air-cooled engine)
Carburetor Cleaning:
Common for dirt bikes of this age to require periodic carburetor cleaning due to fuel varnish and debris, especially if not ridden regularly.
Chain And Sprocket Wear:
Regular maintenance is key to preventing premature wear on the drive chain and sprockets.
Fork Seals:
Fork seal leaks can occur over time and with hard use, requiring replacement.
Kickstart Mechanism:
While generally robust, the kickstart mechanism can develop wear and require adjustment or component replacement.
Yamaha Motorsport Legacy:
Yamaha has a long and successful history in motorcycle racing and off-road sports, known for performance and reliability.
Tt R Series Introduction:
The TT-R series was developed as a range of reliable, user-friendly, four-stroke off-road motorcycles.
Tt R125 Development:
The TT-R125 was introduced as a successor to the older XT/TT series, offering improved technology and rider comfort, with the LW variant providing a longer wheelbase and taller seat for larger riders or improved stability.
Production Years:
The TT-R125 line was produced for many years, with the 2000 model being an early iteration.
Manufacturing Location:
Typically manufactured in Japan or other Yamaha global facilities.
