The Yamaha YZ85 is a motorcycle designed specifically for off-road and Motorcross racing.
It is powered by an 84.7 cc single-cylinder, water-cooled, two-stroke, reed valve inducted engine and uses a six-speed gearbox. There are two wheel options – large wheel, with a 19-inch front and 16-inch rear; and small wheel, with a 17-inch front and 14-inch rear. It weighs 157 lbs (wet)
References
Yamaha YZ85 Wikipedia(Text) CC BY-SA