Thanks, I found the serial number and it is a 91. Are these things 2 stroke or just straight gas ? I just rebuilt all the brakes and took it for a short run down the road to make sure it shifted ok . It runs not too bad, I did notice that it seemed hot when I came back in cyl head temp was around 300f and exhaust was 250 or so. Gear box was around 100 not sure if this is normal ?