It appears you're interested in specifications for the BMW R16 series 4. This Allround model is powered by a Two cylinder boxer, four-stroke engine with 736.00 ccm (44.91 cubic inches) of actual displacement before 7.0:1 compression. Fueling is metered via Carburettor. Amal 26mm allowing this machine to produce its 33.00 HP (24.1 kW) horsepower and torque. According to our records engine heat of the BMW R16 series 4 is moderated by Air. You'll need to get familiar with the 3-speed transmission and pay attention to final drive Shaft drive (cardan) maintainence. Our best information shows that the front tire size is 3.5-26 and the rear is 3.5-26 . The entire package is supported by the frame, Pressed steel duplex. 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 rear brakes. The BMW R16 series 4 was launched in 1933, 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.