It appears you're interested in specifications for the Yamaha YBR250. This Sport model is powered by a Single cylinder, four-stroke engine with 249.00 ccm (15.19 cubic inches) of actual displacement before 9.8:1 compression. Fueling is metered via Injection allowing this machine to produce its 21.05 HP (15.4 kW) horsepower and 20.70 Nm (2.1 kgf-m or 15.3 ft.lbs) torque. According to our records engine heat of the Yamaha YBR250 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 100/80-M17 and the rear is 130/70-M17 . The entire package is supported by the frame, Steel Double Cradle. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Double disc front brakes and Expanding brake (drum brake) rear brakes. The Yamaha YBR250 was launched in 2011, 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.