It appears you're interested in specifications for the Jawa 638. This Unspecified category model is powered by a Twin, two-stroke engine with 350.00 ccm (21.36 cubic inches) of actual displacement before compression. Fueling is metered via allowing this machine to produce its 26.00 HP (19.0 kW) horsepower and 31.38 Nm (3.2 kgf-m or 23.1 ft.lbs) torque. According to our records engine heat of the Jawa 638 is moderated by . You'll need to get familiar with the 4-speed transmission and pay attention to final drive 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 Expanding brake front brakes and Expanding brake rear brakes. The Jawa 638 was launched in 1994, 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.