Powering the Riva 125 is a 4-stroke engine of 125cc displacement. This motor is an air cooled design putting out a healthy 11.4 horsepower at RPM. Torque is 8 ft /lbs at RPM. This motor seems to have been unique to the Riva 125, as no other Yamaha's sold appear to use the same parts beyond a few simple nuts and bolts.
Yamaha Riva 125 - Windscreen Accessory
The Riva 125 can reach about 55mph and usually averages around 80mpg, which means you can cover about 120miles or 200kms on a tank (1.3 gal. / 7 litres) before it's time to stop for gas. This is great milage for a 125cc scooter.
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