Dave

I am having somwhat similar problems as a recent post with my YS63. My engine has about two gallons run through it. It has been running fine up until last week. It will idle fine and run at full throttle okay, but will not run at mid range. I can fly straight and level and it sputters the whole time. I have not changed props or anything. I am running at 1 3/4 turns on the needle valve. I did re-set the valves but it did not help.

Any suggestions?

Hal