I seem to think it's a Honda. They were one of the only ones to be using 4 cyl 4 strokes in the 1960's for the 250 GP racing. But I can't find one with the cowl off so I am just guessin.
Well now I don't think it's a Honda, because of the right hand chain.
Last edited by maDDtraPPer; 03-16-2003 at 01:12 PM.
Here is a picture of the complete bike.
As I was checking on the net about this bike, I could only find one picture so I decided to help you alittle bit.
To be honest I didn't know of such a bike....it may be a special bike!
Ok so I am blurry eyed but I may have an answer. It's a shot in the dark because I cannot find any pictures to back this up. But Moto Guzzi made a short burst of air cooled 4 cyl. 250 cc motorcycles. So thats my last attempt at this one. It is difficult, congratulations!