At the heart of the 2002 Yamaha TT-R 125 cross - motocross motorcycle, Yamaha features a 123.7 cc (7.6 cu in) air-cooled single cylinder, four-stroke configuration. In factory specification, peak output is rated at 9.8 HP (7.2 kW) at 8,000 rpm while maximum torque reaches 9.9 Nm (7.3 lb-ft) at 6,500 rpm. With a specific output of 79.2 HP per liter and a 1,500 rpm working window between peak torque (6,500 rpm) and peak power (8,000 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the TT-R 125 measures 74 kg (163 lbs) dry, translating to a power-to-weight ratio of 0.13 HP/kg (7.55 kg per horsepower). Rider ergonomics and chassis geometry center around a 775 mm (30.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,240 mm (48.8 in) wheelbase engineered for quick, flickable steering geometry.
Within MotoLibrary's Yamaha archive, this model family spans 3 indexed model years from 2002 to 2007, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
79.2 HP/L
Power-to-Weight
0.13 HP/kg (7.55 kg/HP)
Power Band Window
6,500–8,000 rpm
Standover Height
775 mm (30.5 in)
Engine
Displacement123.7 ccm (7.55 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power9.8 HP (7.2 kW)) @ 8000 RPM
Torque9.9 Nm (1.0 kgf-m or 7.3 ft.lbs) @ 6500 RPM
Compression10.0:1
Bore x Stroke54.0 x 54.0 mm (2.1 x 2.1 inches)
Fuel ControlSingle Overhead Cams (SOHC)
CoolingAir
Chassis
Front Travel180 mm (7.1 inches)
Rear Travel160 mm (6.3 inches)
Wheelbase1240 mm (48.8 inches)
Ground Clearance265 mm (10.4 inches)
Wheels & Brakes
Front Tyre70/100-17
Rear Tyre90/100-14
Front BrakesExpanding brake
Front Brake Ø110 mm (4.3 inches)
Rear BrakesExpanding brake
Rear Brake Ø110 mm (4.3 inches)
Dimensions & Weight
Dry Weight74.0 kg (163.1 pounds)
Power/Weight0.1324 HP/kg
Seat Height775 mm (30.5 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
