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I had an 01 Yamaha BWS50. I bought it as a beater for cheap. At first it would do 55 km/h (34 mph) and get 65 mpg. After a tune up (new variator rollers and belt) it would do 65 km/h (40 mph) and get 80 mpg. Then I got crazy and installed a 70cc top end kit and a tall final drive gearset. Then it would do 90 km/h (56 mph), 100 km/h (62 mph) if I tucked behind the dash. I must have looked ridiculous. After that it would get 100 mpg.
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