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 allowing this machine to produce its 4.90 HP (3.6 kW) horsepower and torque. According to our records engine heat of the Yamaha U7E is moderated by Air. You'll need to get familiar with the 3-speed transmission and pay attention to final drive maintainence. Our best information shows that the front tire size is 225-17 and the rear is 250-17 . 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 Expanding brake (drum brake) front brakes and Expanding brake (drum brake) rear brakes. The Yamaha U7E was launched in 1972, 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.