It appears you're interested in specifications for the Yamaha U7E. This Scooter model is powered by a Single cylinder, two-stroke engine with 72.00 ccm (4.39 cubic inches) of actual displacement before 6.8:1 compression. Fueling is metered via Carburettor allowing this machine to produce its 4.90 HP (3.6 kW) horsepower and 6.37 Nm (0.6 kgf-m or 4.7 ft.lbs) torque. According to our records engine heat of the Yamaha U7E is moderated by . You'll need to get familiar with the transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is and the rear is . The entire package is supported by the frame, . We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on front brakes and rear brakes. The Yamaha U7E was launched in 1973, and we're happy to know (or assume) you've got one in your garage. To help you keep your ride in tip-top shape, consider purchasing an owner or service manual.