User:Glassphi/sandbox

Yamaha IT125 belongs to the 'International Trial' family of motorcycles, produced during the 1970s and 1980s. The machine is derived from the Yamaha YZ range of competition motocross bikes with modifications for use in competition enduro, hare and hounds and trail riding.

The bike uses an air-cooled, two-stroke, single-cylinder engine with pre-mixed fuel. It is kick start only.

There are three derivations of the machine for the global market. A Canada market version, a European version and an Oceanic version for other World markets.

The IT bikes were designed and sold as enduros and can still be plated and registered today, provided you make the necessary modifications to the tail light. Another option is to get a historical plate and use the old brake signal along with your other hand signals for turning.

Other bikes in the IT range include IT175, IT200, IT250, IT425, IT465 and IT490.

The IT range was superseded by the WR (Wide Ratio) range of four-stroke machines.

The Environmental Protection Agency (EPA) invoked new regulations restricting Two Strokes in the early 2000s and new rules were set by the American Motorcycle Association (AMA) which set the path for the development of the less powerful four-stroke engines dominate in the sport today.

1980
The IT125G (3R9) was first introduced in 1980 using a bored out 56x50mm 100 cc motocross engine giving 123 cc and using the same port design as the YZ100. A VM39SC carburetor was used along with a reed intake valve. The bike was given a six-speed gearbox with a very low ratio first gear to help in tackling technical trial sections. The frame was based on that of the YZ100 but with half a degree steeper forks to improve steering speed in tighter terrain, facilitated by a lower first gear.

Considerable thought was given to features to improve reliability and usability over extended tests. The rear wheel featured a quick release design.

1981
Introduction of the IT125H (3W1).

1982
IT125J (3W1) Not released in USA.

1983
IT125K (3W1) Not released in USA.

1984
IT125L (3W1) Not released in USA.