It appears you're interested in specifications for the Yamaha YZ 125. This Cross / motocross model is powered by a Single cylinder, two-stroke engine with 124.00 ccm (7.57 cubic inches) of actual displacement before 8.7:1 compression. Fueling is metered via allowing this machine to produce its horsepower and torque. According to our records engine heat of the Yamaha YZ 125 is moderated by Liquid. You'll need to get familiar with the transmission and pay attention to final drive maintainence. Our best information shows that the front tire size is 80/100-21 51M and the rear is 100/90-19 57M . 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 Single disc front brakes and Single disc rear brakes. The Yamaha YZ 125 was launched in 2002, 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.