YAMAHA IT175 (1977-1983) Specs, Performance & Photos

The Yamaha IT175 was a motocross motorcycle modified to race in enduro competitions. The bike was manufactured from 1977 to 1983 and was part of the International Trial (IT) family that comprised several models, including the IT200, IT250, IT425, IT465, and IT490.

The first model was introduced in 1977 and packed a bored-out 125cc motocross engine that used the same port design as the YZ. The bike's frame was based on the one used on the YZ, but with a rake increased for more length and improved high-speed stability.

In 1979, Yamaha released an upgraded model under the IT175F designation, featuring a beefed-up frame and more suspension travel. In addition, the engine was modified to deliver more mid-range power. The front fork trail was reduced for a quicker steering response, and the CDI ignition system was upgraded.

The 1980 IT175G model shared the frame with the YZ125G motorcycle, allowing the adjustable rear shock to be mounted in a laid-down position. For the first time, Yamaha used a box-section aluminum swingarm along with a 36 mm air-assisted fork.

The 1977 Yamaha IT175 had a 171cc two-stroke single-cylinder air-cooled engine with a 34 mm Mikuni carburetor, delivering an output power of 22 hp with a peak force at 9,500 rpm and 17 Nm (13 lb-ft) torque at 8,000 rpm.

The bike's suspension was handled by a telescopic fork on the front and a single shock absorber on the rear, while the braking performance was achieved by drum units both front and back.