If the engine starts, idles for a while and dies out, assuming you have not moved the throttle... then the LOW SPEED needle is set too rich. Turn it in about 1/2 a turn and try again.

If the engine idles, but cuts out as you run it up SLOWLY once it hits about 1/2 throttle or above, then the HIGH SPEED needle is too lean. Open it about 1/2 a turn and try again.


If the engine idles, and runs at high throttle when you bring it up slowly, but then seems to die when you take it back down, and run it up again quickly, then the engine is not transitioning properly.

Usually this is because there is not enough fuel available through the mid-range. When this happens richen (out) the LOW SPEED needle about 1/8th to one quarter of a turn until the engine transitions properly.



Note that transition and idle problems can also be caused by lack of muffer pressure into the fuel tank.

The Evolutions are notorious for developing a grey "goo" or gunk that WILL clog the muffler pressure nipple.

Make a habit of cleaning the nipple out at the start of each flying session. Insert a small hex key that will fit into the opening and move it about to dislodge the crud that forms.