It appears you're interested in specifications for the Yamaha Grizzly 450 Auto 4x4 EPS. This ATV model is powered by a Gear-driven crankshaft balancer shaft and rubber-damper engine mounts 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. Mikuni 33mm BSR allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha Grizzly 450 Auto 4x4 EPS is moderated by Liquid. You'll need to get familiar with the Automatic 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. Hydraulic front brakes and Sealed multidisc. Hydraulic rear brakes. The Yamaha Grizzly 450 Auto 4x4 EPS 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.