It appears you're interested in specifications for the Yamaha XT 660 R. This Enduro / offroad model is powered by a Single cylinder, four-stroke engine with 659.00 ccm (40.21 cubic inches) of actual displacement before 10.0:1 compression. Fueling is metered via Injection allowing this machine to produce its 48.00 HP (35.0 kW) horsepower and 58.40 Nm (6.0 kgf-m or 43.1 ft.lbs) torque. According to our records engine heat of the Yamaha XT 660 R is moderated by Liquid. You'll need to get familiar with the transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 90/90-M21 and the rear is 130/80-M17 . 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 XT 660 R was launched in 2004, 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.