It appears you're interested in specifications for the Yamaha Raptor 90. This ATV model is powered by a Single-axis counterbalancer to reduce vibration Single cylinder, four-stroke engine with 88.00 ccm (5.37 cubic inches) of actual displacement before 10.2:1 compression. Fueling is metered via allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha Raptor 90 is moderated by Air. You'll need to get familiar with the Automatic transmission and pay attention to final drive Belt maintainence. Our best information shows that the front tire size is 18/7-8 and the rear is 18/9-8 . 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 Expanding brake (drum brake) front brakes and Single disc rear brakes. The Yamaha Raptor 90 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.