Yamaha YSR50
Yamaha YSR50 | |
Manufacturer | |
---|---|
Production | 87-93 |
Engine | |
Bore / Stroke | 40.0mm x 39.2mm |
Compression ratio | 7.4:1 |
Top Speed | 38 mph |
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 |
Final Drive | Chain: 420x100 |
Front Sprocket | 12T |
Rear Sprocket | 44T |
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 YSR80 |
Competition | Honda NSR50, Aprilia RS50 |
Manuals | Service Manual |
The Yamaha YSR50 is a motorcycle produced by Yamaha from 1987 to 1993.
This style of miniature motorcycle is known as a pocket bike. Although small in size, these machines are capable of giving surprising performances in the hands of skilled operators. Enthusiast groups organize races and endurance runs for pocket-bikes, of which the YSR Yamaha is the most popular. It mainly competes with the likes of the Honda NSR50. The limited edition Yamaha RX50 shared the same engine.
History[edit | edit source]
Yamaha YSR 50 and YSR 80 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.
1987[edit | edit source]
1990[edit | edit source]
1991[edit | edit source]