It appears you're interested in specifications for the Yamaha WR450F. This Enduro / offroad model is powered by a Five titanium valves Single cylinder, four-stroke engine with 449.00 ccm (27.40 cubic inches) of actual displacement before 12.3:1 compression. Fueling is metered via Carburettor. Keihin FCR 39 allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha WR450F is moderated by Liquid. 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 80/100-M21 and the rear is 110/100-M18 . 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. Wave front brakes and Single disc. Wave rear brakes. The Yamaha WR450F 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.