It appears you're interested in specifications for the Hercules K 103 GS. This Sport model is powered by a Single cylinder, two-stroke engine with 97.00 ccm (5.92 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor. Bing 22mm allowing this machine to produce its 8.20 HP (6.0 kW) horsepower and torque. According to our records engine heat of the Hercules K 103 GS is moderated by Air. 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 3.50-18 and the rear is 3.50-18 . The entire package is supported by the frame, Single cradle. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Expanding brake (drum brake) front brakes and Expanding brake (drum brake) rear brakes. The Hercules K 103 GS was launched in 1967, 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.