Plane: Sig Skyray
Tank: An old Perfect brand wedge tank, 2oz. Before that was a 4oz DuBro clunk, with about the same list of symptoms.
Engine: OS FP, with the remote needle valve.
I'm mostly pleased with this plane that I bought off my nephew, but I'm not exactly getting rock solid engine runs. Today really put things in the spotlight because I forgot to bring my regular fuel and borrowed some with 5% more nitro. This required a different needle valve setting, which messed up both of the flights I got in.
Sometimes I get a nice engine run, sometimes it seems to richen up in the air, sometimes it leans out, sometimes the first half of the flight is nice, sometimes the last half. And any time something changes (like fuel) I have to start the whole struggle over.
Argh.
Suggestions? Is this just because of the remote needle valve, or are there other things I should look at before I blame that?