It appears you're interested in specifications for the Yamaha Why. This Scooter model is powered by a Single cylinder, two-stroke engine with 49.00 ccm (2.99 cubic inches) of actual displacement before 11.2:1 compression. Fueling is metered via Carburettor allowing this machine to produce its 3.35 HP (2.4 kW) horsepower and 3.85 Nm (0.4 kgf-m or 2.8 ft.lbs) torque. According to our records engine heat of the Yamaha Why is moderated by Air. You'll need to get familiar with the 5-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 70/90-16 and the rear is 80/90-16 . The entire package is supported by the frame, Front suspension system. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc front brakes and Expanding brake (drum brake) rear brakes. The Yamaha Why was launched in 2006, 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.