Very nice! Check under the pedal crank for the serial number. 48 Schwinn should start with an E- then 5 numbers I think. Post the number and can look up.
The serial no is located at the rear of frame when checked shows to be a 54 with a 48 motor but has all the belt indentions I cant figure it out did schwinn make frames up to that point?
1948 Schwinn Whizzer motorbike restoration, professional and fully equipped, just a good extra work, has some scrathes paint the top of the front fender, including speedometer, lights, horn and chrome exhaust