Ok, so This is a bit of a long story but here it goes. So about a year ago I found a 1971 Zundapp Rickman, 125cc 2-stroke in my buddies barn, and they didn't want it so they gave it to me for free. The bike was partially seized and was missing cables and such. So The first thing I did was free up the motor and get it to shift and such. This went ok but, but when I took the head off of the motor I accidently snapped the ring. Finding a replacement ring was almost impossible so instead I had the piston machined to fit 2 new standard 54 mm rings, and I had the cylinder honed out. I put the motor all back together and started turning it over but it wouldn't pop. Finally I found that the bike needed a new ignition stator so I got lucky and found one on ebay and bought it. I installed it on the bike and it fired right up however when I turned it off it wouldn't start again. Checked the spark, and that wasn't it so I decided to clean the carb. finally after much effort it started again and I turned it off to see if it would start again. It fired up again but the next day I couldn't get it to start. So I decided to get all the cables and the chain to push start it but after all that work it would start to fire but as soon as I stop running, even if I hold in the clutch it won't continue to run. since then I have bought a new Lectron power jet carb and tried using that, (cause my Bing 53 carb has a hole in the bowl), and even though its a different carb the bike almost starts when I push it but it just won't run anymore. im totally out of ideas and im tired off all this guess and check, the bike has spark, ok compression and gas, and it has ran 4 times but once i turn it off I spend weeks trying to get it to start agian. If you have any information, methods, or know where I can get another motor possibly please reply.