Segment:
Entry-level to intermediate off-road and recreational trail riding motorcycle.
Competitors:
Honda CRF100F/CRF125F, Kawasaki KLX110/KLX125, Suzuki DR-Z110/DR-Z125.
Versatility:
Suitable for trail riding, recreational use, and beginner motocross, with the 'L' model offering a slightly taller seat and potentially disc brakes for enhanced performance.
Reliability:
Yamaha's reputation for robust and reliable air-cooled 4-stroke engines.
Engine:
Complete engine disassembly, assembly, tuning, and troubleshooting for the 125cc air-cooled 4-stroke engine.
Transmission:
5-speed transmission operation, inspection, repair, and clutch service.
Fuel System:
Carburetor adjustment, cleaning, and rebuilding (likely Mikuni VM series), fuel tank, and fuel line maintenance.
Ignition System:
CDI ignition system, spark plug selection, troubleshooting, and testing.
Electrical System:
Wiring diagrams, lighting system (headlight, taillight, turn signals if equipped on L model), battery maintenance, and charging system.
Suspension:
Front telescopic forks (including oil level and seal replacement), rear monoshock suspension adjustment and maintenance.
Brakes:
Front and rear drum brakes (standard model) or front disc and rear drum (L model) inspection, adjustment, and service.
Chassis And Frame:
Frame inspection, steering head bearing service, and general chassis maintenance.
Wheels And Tires:
Tire inspection and replacement, spoke tension adjustment, wheel bearing service.
Frame And Bodywork:
Includes procedures for removing and inspecting body panels, seat, fuel tank, and frame components.
Routine Maintenance:
Oil changes, air filter cleaning/replacement, spark plug inspection, chain lubrication and adjustment, brake checks.
Troubleshooting:
Diagnostic procedures for common starting issues, running problems, and electrical faults.
Repair Procedures:
Detailed step-by-step instructions for component disassembly, cleaning, inspection, and reassembly.
Component Rebuilds:
Carburetor, engine top-end (piston, rings, cylinder), and transmission rebuilds.
Wiring Diagrams:
Complete electrical system schematics for fault finding and component identification.
Engine Tuning:
Valve clearance adjustment, ignition timing checks, and carburetor jetting guidance for optimal performance.
Depth:
Comprehensive, covering routine maintenance, intermediate repairs, and major engine/component overhauls.
Diagnostic Charts:
Includes troubleshooting charts for identifying and resolving common operational problems.
Purpose:
Designed for both the motorcycle owner performing routine maintenance and the technician undertaking in-depth repairs.
Digital Format:
Searchable PDF with high-resolution diagrams and clear text.
Print Quality:
High-resolution scans for clear reproduction of diagrams and text, suitable for printing.
Binding:
Perfect bound or spiral bound (for printed versions) for lay-flat usability.
Paper Type:
Durable, high-quality paper stock resistant to grease and dirt (for printed versions).
Engine Type:
124cc, Air-cooled, 4-stroke, SOHC, 2-valve
Bore X Stroke:
54 mm x 54 mm
Carburetor:
Mikuni VM20 (typical, subject to regional variations)
Valve Actuation:
SOHC (Single Overhead Camshaft) with 2 valves per cylinder.
Horsepower Est:
Approx. 10-12 HP (at crankshaft, dependent on tuning and specific model variant)
Torque Est:
Approx. 7-8 lb-ft (at crankshaft, dependent on tuning and specific model variant)
Fuel Capacity:
1.4 US gallons (5.5 L)
Fuel Type:
Unleaded gasoline, minimum 87 octane
Safety Features:
Standard motorcycle safety equipment including brakes, lighting, and reflectors. No formal crash ratings apply as it's not a car.
Braking System:
Drum brakes (front and rear on TT-R125) or Front Disc/Rear Drum (TT-R125L).
Lighting:
Halogen headlight, taillight/stoplight, and reflector system for visibility.
Features:
Basic motorcycle instrumentation: speedometer (on L model), odometer, trip meter, neutral indicator, and indicator lights. No advanced infotainment systems.
Features:
None. This is a mechanically operated motorcycle focused on fundamental riding dynamics.
Features:
None. Focus is on mechanical systems and rider control.
Engine Oil Change:
Every 1,000 km (600 miles) or 6 months, whichever comes first. Check manual for specific oil type.
Air Filter Cleaning:
Every 500 km (300 miles) or as needed based on riding conditions. More frequent cleaning is recommended in dusty environments.
Spark Plug Inspection:
Every 1,000 km (600 miles) or annually. Replace if gap is incorrect or electrode is worn.
Chain Lubrication:
Every 200 km (125 miles) or after riding in wet conditions. Adjust tension as needed.
Engine Oil Type:
Yamalube 4 (or equivalent motorcycle-specific 4-stroke engine oil) SAE 10W-40 API SE, SF or SG or JASO MA.
Engine Oil Capacity:
0.95 L (1.0 US qt)
Fork Oil Type:
Yamaha Suspension Oil (or equivalent 10W fork oil).
Fork Oil Capacity:
Specific volume per fork leg detailed in the manual, typically around 200-250cc.
Carburetor Clogging:
Common in carbureted engines, especially if the bike sits for extended periods. Regular cleaning and using fuel stabilizer is recommended.
Clutch Slippage:
Can occur with aggressive riding or if clutch plates are worn. Check adjustment and condition.
Suspension Seals:
Front fork seal leaks can occur over time, especially with off-road use. Manual provides replacement procedures.
Heritage:
Yamaha's long-standing reputation for producing high-quality, durable motorcycles across various disciplines, including off-road.
Predecessors:
Evolved from Yamaha's lineage of smaller displacement off-road motorcycles, building on the success of models like the TT-R100.
Production Years:
The TT-R125 platform was in production from 2000 through 2006, with variations and updates.
Manufacturing Location:
Typically manufactured in Japan, though specific assembly locations can vary by region and model year.
