| MODEL | YAMAHA TZ 125 2002 |
| Year | 2002 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 124 cc / 7.57 cu in |
| Bore X Stroke | 54.0 x 54.5 mm / 2.1 x 2.1 in |
| Compression Ratio | 7.9:1 |
| Cooling System | Liquid |
| Max Power | 32.1 kW / 44 hp @ 12250 rpm |
| Max Torque | 25 Nm / 18.4 lb-ft @ 12000 rpm |
| Ignition | — |
| Induction | — |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | — |
| Clutch | — |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Wheel travel 100 mm / 3.9 in |
| Rear Suspension | Wheel travel 129 mm / 5.1 in |
| Front Brakes | Single disc, 298 mm / 11.7 in |
| Rear Brakes | Single disc, 185 mm / 7.3 in |
| DIMENSION SPECS | |
| Overall Length | 1828 mm / 72.0 in |
| Overall Width | 510 mm / 20.1 in |
| Overall Height | 1033 mm / 40.7 in |
| Seat Height | 701 mm / 27.6 in |
| Wheelbase | 1242 mm / 48.9 in |
| Ground Clearance | 110 mm / 4.3 in |
| Dry Weight | 71.2 kg / 157 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 95/70-R17 |
| Rear Tyre | 125/55-R17 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | — |
The TZ125 is Yamaha's customer road-racing two-stroke for the 125 class, sold for track use only. A high-revving liquid-cooled single with a very light chassis, it served as a stepping stone for young racers moving up to the GP ranks.
