It appears you're interested in specifications for the Beta Jonathan 350. This Custom / cruiser model is powered by a Single cylinder, four-stroke engine with 349.00 ccm (21.30 cubic inches) of actual displacement before compression. Fueling is metered via Carburettor. Mikuni BST 33 allowing this machine to produce its horsepower and torque. According to our records engine heat of the Beta Jonathan 350 is moderated by Air. You'll need to get familiar with the 6-speed transmission and pay attention to final drive maintainence. Our best information shows that the front tire size is 120/80-16 and the rear is 140/90-15 . The entire package is supported by the frame, Steel. We know you like to go fast or cruise all day, but when you need to stop, you'll be dependant on Single disc front brakes and Single disc rear brakes. The Beta Jonathan 350 was launched in 2006, 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.