Yamaha YSR50
Encyclopedia
The Yamaha YSR50 was a miniature sport bike
Sport bike
A sport bike, also written as sportbike, is a motorcycle optimized for speed, acceleration, braking, and cornering on paved roads, typically at the expense of comfort and fuel economy in comparison to less specialized motorcycles...

 that was produced and sold by Yamaha
Yamaha Motor Company
, is a Japanese motorized vehicle-producing company. Yamaha Motor is part of Yamaha Corporation and its headquarter is located in Iwata, Shizuoka. Along with expanding Yamaha Corporation into the world's biggest piano maker, then Yamaha CEO Genichi Kawakami took Yamaha into the field of motorized...

 during the late eighties and early nineties. The bike featured an air-cooled 50cc two-stroke engine. The engine was sometimes swapped out for a larger variety.

Its first production year was 1987, and it was last made in 1992. American Motorcyclist magazine stated its top speed was 38 mph.
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