I have had 3 of these engines and al have run very well. But they all have had weird needle settings.

All three needed to have the high speed needle out about 3 to 4 turns to run good. I still have one on a Kangke cap 232 and it runs very well. I have the high speed needle out at 3 1/2 turns.

All three of my 91 fx engines have had this problem. It seems to me that 3 to 4 turns is way too much but they dure run good at that setting.

Anything less than 3 turns and they all will dead stick just as you described.

Givve it a try at 3 to 4 turns it will seem a little rich but once in the air they run great.

Let us know what happens and good luck!!!