Bill,

Most older Enyas need a lot of break-in, many newer ones do not. Some you can just run it a little rich and fly (as the instructions say).

If they are tight, the quickest and easiest way to break in both the Enya .09 and the .40 (assuming both are iron pistons in steel cylinder) is to run for short (~1-2 minute) periods with complete cool down between runs. Each run is considered a heat cycle. Starting rich, every other run lean it out a couple of clicks. As long as it doesn't overheat, continue. If it overheats, richen a couple of clicks and continue. When you reach maximum RPM, try to run out a full tank of fuel. If it holds a steady setting it is broken-in.

Stunt flaps move in the opposite direction of the elevator. Their purpose is to produce extra wing lift, both right side up and inverted. By producing additional wing lift, the maneuvers become tighter. This is especially effective in the square and triangular maneuvers. They have absolutely no connection with aileron function.

Hope this helps a little.

George