I got this bike and it had some serious timing issues and seriously bad oil leaks. Took the thing apart, finally got the timing on, sealed the engine and put it back together. Once i got the carb on and turned the gas on, it was overfueling and gas pouring everywhere. I ordered a float valve for it and pu tthaqt in so now that issue is no longer. I can set the airscrew at 2 turns out and it starts but has a bogging point in it. I can drive it for a few minutes then it gets worse. I tried to play with the settings on the carb and it made it worse. So again i set it back to normal. No it is just backfiring and when it does start i have to hold the throttle about half way and it surges on its own. I got this bike for free and its only cost me 7 dollars so far for the float valve, but i just want it to run and go for a rip. By the way, when it fires up cold it runs like a top, it idles and everything. If someone could please give me a suggestion or 2 on where to start looking for issues i would greatly appreciate it. Thanks. One last thing. Yes i cleaned the carb about a million times.