It appears you're interested in specifications for the Yamaha YFM90R. This ATV model is powered by a 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 Carburettor. TK SVR 22 mm allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha YFM90R is moderated by Air. You'll need to get familiar with the Automatic transmission and pay attention to final drive Chain 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). Dual sealed drom front brakes and Expanding brake (drum brake) rear brakes. The Yamaha YFM90R was launched in 2017, 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.