"Just throwing out a guess. Looks like an early 60's Yamaha. I was going to say a 250 but, judging by the headlight size, I'm guessing maybe a 125 twin or maybe a 180 (don't remember when the 180 came out for sure). I don't remember. It's a Sport model because of the upswept pipes, sometimes called a "Scrambler" back then. Actually, after I got to looking at it again, I'm not sure but it looks like a one cylinder job. Again, I'm just guessing."
Bill, I always learn so much from reading your posts. . .