Segment:
Entry-level/Recreational Off-Road Motorcycle
Target Audience:
Beginner riders, youth riders, trail enthusiasts, and those seeking a reliable and manageable off-road experience.
Key Competitors 2001:
Honda CRF100F/XR100R, Kawasaki KLX110/125, Suzuki DR-Z125.
Model Characteristics:
User-friendly power delivery, manageable size and weight, durable construction, electric start option (on some variants), suitable for a wide range of rider skill levels.
Engine:
Complete engine overhaul, top-end and bottom-end components, cooling system, lubrication, fuel system, ignition system, exhaust system, starting system.
Transmission:
Clutch operation and inspection, gearbox disassembly and reassembly, shift mechanism, lubrication.
Chassis:
Frame inspection and repair, suspension (front fork and rear shock absorber), steering system, wheel and tire maintenance, brake system (front and rear), electrical system (wiring diagrams, lighting, battery, charging system).
Maintenance:
Regular servicing, oil changes, filter replacements, chain adjustment, spark plug service, air filter cleaning/replacement, brake pad inspection and replacement, general cleaning and lubrication.
Repair:
Engine component replacement, carburetor tuning and repair, electrical troubleshooting, suspension seal replacement, brake caliper servicing, wheel bearing replacement, linkage lubrication and adjustment.
Troubleshooting:
Diagnostic procedures for common starting issues, engine performance problems, electrical malfunctions, braking anomalies, and suspension issues, often with symptom-based troubleshooting trees.
Depth:
Comprehensive: Covers everything from basic scheduled maintenance and routine adjustments to complete engine teardowns, carburetor rebuilding, and detailed electrical system diagnostics and repair.
Type:
4-stroke, SOHC, air-cooled
Bore X Stroke:
54.0 mm x 54.5 mm
Estimated Horsepower:
Approx. 10-12 HP (at flywheel, varies with tuning)
Estimated Torque:
Approx. 7-8 lb-ft (at flywheel, varies with tuning)
Carburetor:
Mikuni VM20SS (or similar) with manual choke
Fuel Type:
Unleaded gasoline, minimum 87 octane
Oil Type:
Yamalube 4 (or equivalent SAE 10W-40 API SG or higher, JASO MA)
Oil Capacity W Filter:
0.90 L (0.95 US qt)
Type:
CDI (Capacitor Discharge Ignition)
Spark Plug:
NGK CR7HSA (or equivalent)
Method:
Kick starter and/or Electric start (depending on specific sub-model)
Type:
Constant-mesh 5-speed, constant-loop lubrication
Gear Ratios Approximate:
1st: 2.833, 2nd: 1.875, 3rd: 1.350, 4th: 1.087, 5th: 0.917
Clutch Type:
Wet, multi-plate
Final Drive:
Chain drive (520 pitch, approx. 13T front sprocket, 50T rear sprocket common)
Engagement:
Manual clutch lever operation
Transmission Oil:
Yamalube 4 (or equivalent SAE 10W-40 API SG or higher, JASO MA), same as engine oil.
Length:
Approx. 1825 mm (71.9 in)
Width:
Approx. 765 mm (30.1 in)
Height:
Approx. 1060 mm (41.7 in)
Wheelbase:
Approx. 1260 mm (49.6 in)
Ground Clearance:
Approx. 275 mm (10.8 in)
Dry Weight:
Approx. 81 kg (178.6 lbs)
Wet Weight:
Approx. 85 kg (187.4 lbs) (with all fluids)
Maximum Load:
Not officially specified, generally intended for single rider and gear up to 200 lbs.
Front Travel:
Approx. 170 mm (6.7 in)
Rear Travel:
Approx. 168 mm (6.6 in)
Front Tire:
2.50-17 (common)
Rear Tire:
3.00-14 (common)
Safety Certification:
Off-road use only, not typically street-legal from the factory without modifications. EPA emissions compliant for off-road use.
Braking System:
Hydraulic disc front brake, drum rear brake (common for 2001 models, some later models had disc rear).
Frame Construction:
Steel semi-double cradle frame for rigidity and durability.
Lighting:
Headlight, taillight/brake light (basic functionality for off-road visibility).
Oil Change:
Every 1000 km (600 miles) or 6 months, whichever comes first.
Air Filter Cleaning:
Every 1000 km (600 miles) or more frequently in dusty conditions.
Spark Plug Check:
Every 1000 km (600 miles).
Chain Lubrication:
Every 500 km (300 miles) and after washing or riding in rain.
Valve Clearance Check:
Every 4000 km (2500 miles).
Engine Oil Viscosity:
SAE 10W-40
Engine Oil Standard:
API SG or higher, JASO MA
Brake Fluid:
DOT 3 or DOT 4 (for hydraulic systems)
Coolant:
N/A (Air-cooled engine)
Carburetor Tuning:
Can be sensitive to altitude and temperature changes, requiring periodic adjustment. Clogged jets are common if fuel is left standing for extended periods.
Clutch Wear:
Clutch plates may wear over time, particularly with aggressive riding, leading to slipping. Regular adjustment and eventual replacement are necessary.
Suspension Seals:
Fork seals can degrade, leading to oil leaks. Regular inspection and replacement are recommended, especially in dusty environments.
Chain And Sprockets:
Wear on the drive chain and sprockets is normal. Proper lubrication and adjustment extend their life; replacement is typically needed every 5,000-10,000 miles depending on maintenance.
Manufacturer:
Yamaha Motor Company, a global leader in motorcycle and powersports manufacturing, known for innovation and performance.
Predecessor:
TT-R125 benefited from Yamaha's extensive experience in motocross and trail bikes, evolving from models like the PW series and previous TT-R offerings.
Key Changes 2001:
Introduction of the TT-R125 platform, establishing its reputation for reliability and ease of use in the 125cc off-road segment. Offered in kick-start and electric-start variants.
Production Years:
2000 - Present (with ongoing updates and variations)
Manufacturing Location:
Japan and other international Yamaha facilities.
Industry Standing:
Consistently regarded as a benchmark for entry-level trail bikes due to its balance of performance, reliability, and user-friendliness. Popular choice for youth motocross and trail riding schools.
Rider Reviews General:
Highly rated by riders for its ease of maintenance, forgiving nature, and capability on various off-road terrains.
Emissions:
Meets EPA emissions standards for off-road vehicles applicable at the time of manufacture.
