Hi,

I'm getting back into RC flying after the interruption of starting a family. I have an ASP .61 that ran great back in the day but has been sitting for 13 years mounted on a Big Stick. I took the engine apart and cleaned it up and it started right up. I didn't have any trouble getting it to run up or idle so I headed for the field. I started having problems with the first flight. When the engine was running wide open, It would lose power and not die immediatly but sort of idle and would run up if I cut the throttle way back It was kind of like running out of gas. I was able to reproduce the same behaviour while static in a yoke on the flight line where wide open for a while it would get into this mode where it lost power and would only stay running if I cut back on the throttle. At this point I started having trouble adjusting the high speed needle valve. It became real stiff. I discovered that the O-ring on the needle valve was shot. I had some trouble finding another O-ring and the one I settled on doesn't fit as well as the original. I still have the problem to some degree as before but I noticed another thing that may be a good clue for someone who knows about engines. When running wide open at about a half turn away from too lean, if I pinch the fuel line, the engine cuts as expected but it cannot recover when the restriction is removed. It shows the same symptom as above where it stays at almost an idle and the only way to keep the engine from dieing is to cut the trottle and gradually increase once RPMs pick up.

Can anyone tell me what I may be looking at here?

Thanks,
Marc