I know,my ECHO 21.2cc -1.3 clone-runs real nice-I am running an apc 16x4w prop on it though.Have'nt flown it yet but it pulls my engine stand real hard.I have a post up "FPE clone" I'm sure you have read it.Mine is stock too,.......Hmm maybe I'll do some mods on it or send it to you av8tor1977! If yer interested.Mines full gasoline though.I'd like to keep it that way.