It appears you're interested in specifications for the Yamaha YZ250. This Cross / motocross model is powered by a Reed-valve inducted Single cylinder, two-stroke engine with 249.00 ccm (15.19 cubic inches) of actual displacement before 8.9:1 compression. Fueling is metered via Carburettor. Keihin PWK38S allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha YZ250 is moderated by Liquid. You'll need to get familiar with the 5-speed transmission and pay attention to final drive maintainence. Our best information shows that the front tire size is 80/100-21 and the rear is 110/90-19 . 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 Single disc. Hydraulic front brakes and Single disc. Hydraulic rear brakes. The Yamaha YZ250 was launched in 2012, 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.