At the heart of the 2002 Yamaha TZ 125 sport motorcycle, Yamaha pairs a 124 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 44 HP (32.1 kW) at 12,250 rpm while maximum torque reaches 25 Nm (18.4 lb-ft) at 12,000 rpm. With a specific output of 354.8 HP per liter and a 250 rpm working window between peak torque (12,000 rpm) and peak power (12,250 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the TZ 125 measures 71.2 kg (157 lbs) dry, translating to a power-to-weight ratio of 0.62 HP/kg (1.62 kg per horsepower). Rider ergonomics and chassis geometry center around a 701 mm (27.6 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 1,242 mm (48.9 in) wheelbase engineered for quick, flickable steering geometry.
Specific Output
354.8 HP/L
Power-to-Weight
0.62 HP/kg (1.62 kg/HP)
Power Band Window
12,000–12,250 rpm
Standover Height
701 mm (27.6 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power44.0 HP (32.1 kW)) @ 12250 RPM
Torque25.0 Nm (2.5 kgf-m or 18.4 ft.lbs) @ 12000 RPM
Compression7.9:1
Bore x Stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
CoolingLiquid
Chassis
Front Travel100 mm (3.9 inches)
Rear Travel129 mm (5.1 inches)
Wheelbase1242 mm (48.9 inches)
Ground Clearance110 mm (4.3 inches)
Wheels & Brakes
Front Tyre95/70-R17
Rear Tyre125/55-R17
Front BrakesSingle disc
Front Brake Ø298 mm (11.7 inches)
Rear BrakesSingle disc
Rear Brake Ø185 mm (7.3 inches)
Dimensions & Weight
Dry Weight71.2 kg (157.0 pounds)
Power/Weight0.6180 HP/kg
Seat Height701 mm (27.6 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.
