It appears you're interested in specifications for the Yamaha YZ85. This Cross / motocross model is powered by a Reed-valve inducted Single cylinder, two-stroke engine with 85.00 ccm (5.19 cubic inches) of actual displacement before 8.2:1 compression. Fueling is metered via Carburettor. Keihin PWK 28 allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha YZ85 is moderated by Liquid. You'll need to get familiar with the 6-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 70/100-17 and the rear is 90/100-14 . The entire package is supported by the frame, Single-backbone, semi-double-cradle frame. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc. Hydraulic front brakes and Single disc. Hydraulic rear brakes. The Yamaha YZ85 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.