It appears you're interested in specifications for the Yamaha YFZ450. This ATV model is powered by a Titanium valves Single cylinder, four-stroke engine with 449.00 ccm (27.40 cubic inches) of actual displacement before 11.4:1 compression. Fueling is metered via Carburettor. Mikuni 42mm BSR allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha YFZ450 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 21/7-10 and the rear is 20/10-9 . 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 Double disc. Hydraulic disc front brakes and Single disc. Hydraulic Disc rear brakes. The Yamaha YFZ450 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.