The restoration of my friends m20 is drawing to a close and I finally have it a point where I could start it. The bike ran when I got it and sounded fine, so I only removed the head and barrel to clean and paint them and change the gaskets etc. I did not remove the magneto or dynamo as I did not need to and did not want to change the timing.
After I had stopped the fuel pouring out of the carb and creating a fire hazard, much kicking over ensued, and it eventually fired up and sounded great, nice and smooth and good even throttle response. However it died after a short run much like it had run out of fuel accept it hadn’t and after further kicking over and some spectacular back fires it ran again but died the same as before. I took the carb apart checked the jet the float and valve and it all looked good, fuel flow from the tank excellent so it went back together and I changed the spark plug for a new L10 and fired it up again. It ran the same again but slightly better and then died with a flurry of back fires. The dog by this point was taking shelter from the backfiring:grimacing: . I checked the advance/retard when running and seemed to work fine and the choke the same, as it was dying I pulled in choke and it didn’t help. As magneto bikes are new to me, before start poking at the bike does anyone have any pointers to try first.
Regards
Grahame
email (option): packagingmuseum@gmail.com