Yamaha YSR80

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Yamaha YSR80
Production 87-93
49.3cc 2-stroke, single cylinder, air-cooled with reed valve
Bore / Stroke 40.0mm x 39.2mm
Compression ratio 7.4:1
Horsepower 7 horsepower @ 8,800 RPM
Torque 0.59 kg-m @ 8,500 RPM
Fuel System Carburetor, Mikuni VM16SH
Spark Plug NGK B8HS '87-93
Battery YUASA 6N4-2A-2 '87-93
Transmission 5-speed constant mesh
Front Tire 3.50-12 '87-93
Rear Tire 4.00-12 '87-93
Wheelbase 1050mm
Length 1575mm
Width 635mm
Height 930mm
Seat Height 650mm
Weight 75kg (dry),
Recommended Oil Yamalube 10w-40
Related Yamaha RX50 (contained same engine), Yamaha YSR85
Manuals Service Manual


Yamaha YSR 80 and YSR 50 sport models goes on sale in Japan in 1986, and had the look of a re-shaped, scaled-down YZR500 factory racer that appealed to the spirit of race enthusiasts. The 2-stroke single-cylinder engine had a maximum output of 7 ps for the 50cc and 8.8 ps for the 80cc, a return type 5-speed transmission, front disc brake and other features to offer full-fledged sport riding potential. It became a standard in the mini-bike races popular at the time. 1992 was the last year of production, and the price was 189.000 yen for the 50cc and 211.000 yen for the 80cc.


See Also[edit]