| MODEL | YAMAHA IT 125 1980 |
| Year | 1980 |
| Engine Type | Two-stroke, single cylinder, reed-valve induction |
| Displacement / Capacity | 123 cc / 7.51 cu in |
| Bore X Stroke | 56 x 50 mm |
| Compression Ratio | 8.1:1 |
| Cooling System | Air cooled |
| Max Power | 12.7 kW / 17.36 hp @ 8500 rpm |
| Max Torque | 14.5 Nm / 10.73 lb-ft @ 8500 rpm |
| Ignition | CDI |
| Induction | 30 mm Mikuni carburetor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 Speed |
| Clutch | Wet, multi-disc |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Single-downtube full cradle, chromoly tubular frame and swingarm |
| Front Suspension | Telescopic forks, 180 mm / 7.0 in travel |
| Rear Suspension | Monoshock, 200 mm / 7.8 in travel |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 846 mm / 33.3 in |
| Wheelbase | 1365 mm / 53.7 in |
| Ground Clearance | 284 mm / 11.2 in |
| Dry Weight | — |
| Wet Weight | 99 kg / 218 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.00 x 21 |
| Rear Tyre | 4.10 x 18 |
| FUEL SYSTEM | |
| Fuel Capacity | 8.5 Litres / 2.2 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 1980 IT 125 was the smallest of Yamaha's International Trial enduro bikes, an air-cooled reed-valve two-stroke with monoshock rear suspension and a six-speed box. It was built for trail and enduro riding and derived from the YZ motocross line.
