Yamaha IT 425: history, specs, pictures
| Yamaha IT 425 | |
| Manufacturer | |
|---|---|
| Production | 1981 |
| Class | Enduro |
| Engine | Two stroke, single cylinder, read valve, air cooled |
| Bore / Stroke | 83.8mm x 83.8mm |
| Compression ratio | 7.3:1 |
| Horsepower | 36.88 HP (27.5 KW) @ 6000RPM |
| Torque | 30.98 ft/lbs (42.0 Nm) @ 5500RPM |
| Fuel System | 38mm VM38SS Mikuni carburetor |
| Transmission | Gear box: 5-Speed Final Drive: Chain |
| Suspension | Front: 43mm Telescopic adjustable forks, 300mm wheel trave Rear: Mono shock, adjustable spring preload and rebound damping, 300mm wheel travel |
| Brakes | Front: Drum Rear: Drum |
| Front Tire | 3.00 -21 |
| Rear Tire | 150/80 -18 |
| Wheelbase | 56.3 inches (1430 mm) |
| Weight | 122.0 kg (wet) |
| Recommended Oil | Yamalube 10w-40 |
| Manuals | Service Manual |
The Yamaha IT 425 was a Two stroke, single cylinder, read valve, air cooled Enduro motorcycle produced by Yamaha in 1981. Max torque was 30.98 ft/lbs (42.0 Nm) @ 5500 RPM. Claimed horsepower was 36.88 HP (27.5 KW) @ 6000 RPM.
Engine[edit | edit source]
A 83.8mm bore x 83.8mm stroke result in a displacement of just 425.0 cubic centimeters.
Drive[edit | edit source]
The bike has a 5-Speed transmission. Power was moderated via the Wet multi-discs.
Chassis[edit | edit source]
It came with a 3.00 -21 front tire and a 150/80 -18 rear tire. Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a 43mm Telescopic adjustable forks, 300mm wheel trave while the rear was equipped with a Mono shock, adjustable spring preload and rebound damping, 300mm wheel travel. The wheelbase was 56.3 inches (1430 mm) long.
1981 Yamaha IT 425[edit | edit source]
For 1980, Yamaha comes with a new 425cc, two stroke power plant out muscles many bigger engines. Yamaha`s reed valve Torque Induction churns out gobs of low end torque and ensures steady, reliable power at any spped.