| MODEL | YAMAHA DT 125 1975 - 1976 |
| Year | 1975 - 1976 |
| Engine Type | Two stroke, single cylinder |
| Displacement / Capacity | 123 cc / 7.5 cu in |
| Bore X Stroke | 56 x 50 mm |
| Compression Ratio | 6.9:1 |
| Cooling System | Air cooled |
| Max Power | 12.9 kW / 17.3 hp @ 7000 rpm |
| Max Torque | 1.4 kgf-m / 10 lb-ft @ 7000 rpm |
| Ignition | Magneto |
| Induction | Mikuni TS28SS carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shocks |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 125 kg / 275.5 lbs |
| WHEEL SPECS | |
| Front Tyre | 2.75-21 |
| Rear Tyre | 3.50-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 9.5 Litres / 2.5 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The early air-cooled DT125 trail bike with conventional twin rear shocks and a five-speed gearbox, before Yamaha moved to the single-shock Monocross rear end. A simple two-stroke enduro-style machine with drum brakes and a tall 21 inch front wheel, aimed at light trail work and road use.
