It appears you're interested in specifications for the Yamaha XS 650 CX6. This Allround model is powered by a Twin, four-stroke engine with 653.00 ccm (39.85 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor allowing this machine to produce its 50.00 HP (36.5 kW) horsepower and torque. According to our records engine heat of the Yamaha XS 650 CX6 is moderated by Air. You'll need to get familiar with the 5-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is and the rear is . 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 Expanding brake (drum brake) rear brakes. The Yamaha XS 650 CX6 was launched in 1979, 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.