I do have friends in the club but I'm always having problems with engines and asking for help. They all say I should quit buying planes and engines and fly the ones I have.
Anyway I'm running a 14x6 zinger also tried the rcgf 15x6 they seem to recommend for this engine but didn't help. A 6v battery fully charged and cycled which actually may be over 6v but I don't have a 4.8 to try. I'm using regular stihl oil for breakin. Personally idk if it would be all that as it was running great before.
I tried again today back at factory settings and it idles ok until I give throttle even slowly it dies I then began turning low needle until it ran at 5 turns, got the high where it needed to be and it seemed to run fine and transition for about 5 min and started spitting and sputtering like a dirt bike and died. After that it will not even begin to start so I gave it a rest.