It appears you're interested in specifications for the Harley-Davidson Model D. This Sport model is powered by a V2, four-stroke engine with 742.60 ccm (45.31 cubic inches) of actual displacement before 7.5:1 compression. Fueling is metered via Carburettor allowing this machine to produce its horsepower and torque. According to our records engine heat of the Harley-Davidson Model D is moderated by . You'll need to get familiar with the 3-speed transmission and pay attention to final drive Chain maintainence. Our best information shows that the front tire size is 26-Mar and the rear is 26-Mar. 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 front brakes and rear brakes. The Harley-Davidson Model D was launched in 1929, 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.