So I've got the XYZ 50 running nicely now. Steady idle and very good high end (will tac it tomorrow). Was a combination of opening the low speed needle and also adding liquid gasket to the surfaces and gaskets around the carb manifold. Seems like there might have been a slight air leak that was increasing with the higher RPMs. Now with the liquid gasket she's running very nicely. I also saw that the Halls Sensor had loosened slightly and shifted a touch, so I re-centered that. That didn't seem to make a difference.

One more recent issue with this plane - now when the engine is running the elevators shake and move intermittently on their own - my guess is radio interference. This intermittent movement is independent of whatever controls I do. I've had this plane for over a year and this is a new development. Can radio interference pop up out of nowhere? From what I see I can't find any obvious wear on any cables. Am wondering if Ch 2 on the receiver might be going bad (though the elevators work fine when the engine's not running). Any other thoughts? Guess I can swap in another EI to see if that's the cause. Any ideas on what I should look for that might be generating radio interference?