| MODEL | YAMAHA TDR 125 1989 - 1992 |
| Year | 1989 - 1992 |
| Engine Type | Two stroke, single cylinder |
| Displacement / Capacity | 124 cc / 7.6 cu in |
| Bore X Stroke | 56 x 50.7 mm |
| Compression Ratio | 6.6:1 |
| Cooling System | Liquid cooled |
| Max Power | 18.6 kW / 25 hp @ 9500 rpm |
| Max Torque | 2.1 kgf-m / 15.1 lb-ft @ 9500 rpm |
| Ignition | Electronic |
| Induction | 28 mm Mikuni TM carburettor |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | 38 mm telescopic forks |
| Rear Suspension | Monoshock, 5-way adjustable preload |
| Front Brakes | Single 282 mm disc, 2-piston caliper |
| Rear Brakes | Single 220 mm disc, 1-piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 850 mm / 33.4 in |
| Wheelbase | 1405 mm / 55.3 in |
| Ground Clearance | 270 mm / 10.6 in |
| Dry Weight | 135 kg / 297.6 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 100/90-18 |
| Rear Tyre | 130/80-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 11 Litres / 2.9 US gal |
| Fuel Consumption | 23 km/l |
| Top Speed | 140 km/h / 86.9 mph |
The first-generation TDR 125 was a small two-stroke dual-purpose machine with a road-biased chassis, an 18-inch front wheel and a six-speed gearbox. It was a lightweight learner-class sports trail bike with disc brakes at both ends.
