It appears you're interested in specifications for the Yamaha XJ 650 Turbo. This Sport touring model is powered by a In-line four, four-stroke engine with 653.00 ccm (39.85 cubic inches) of actual displacement before 8.5:1 compression. Fueling is metered via Turbo allowing this machine to produce its 90.00 HP (65.7 kW) horsepower and torque. According to our records engine heat of the Yamaha XJ 650 Turbo is moderated by Air. You'll need to get familiar with the 5-speed transmission and pay attention to final drive Shaft drive (cardan) maintainence. Our best information shows that the front tire size is 3.25-19 and the rear is 120/90-18 . 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 Dual disc front brakes and Expanding brake rear brakes. The Yamaha XJ 650 Turbo was launched in 1984, 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.