It appears you're interested in specifications for the Yamaha Grizzly 450. This ATV model is powered by a Single cylinder, four-stroke engine with 421.00 ccm (25.69 cubic inches) of actual displacement before 10.0:1 compression. Fueling is metered via Carburettor. BSR33/1 allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha Grizzly 450 is moderated by Liquid. You'll need to get familiar with the transmission and pay attention to final drive Shaft drive (cardan) maintainence. Our best information shows that the front tire size is 25/8-12 and the rear is 25/10-12 . 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 front brakes and Sealed multidisc rear brakes. The Yamaha Grizzly 450 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.