My son in law has an Alpha trainer w/ the evolution engine and is seems to perform quite well with very little tweaking and changed the three bladed prop to a two blade 11x6 and it screams. high speed performance improved about 900 rpm. There is a high-low idle setting opposite of the needle setting w/ a set pin to keep from over-setting the suggested range for idle. If the engine loads up after idling try leaning the idle but use care not to over do it just use little increments at a time. Move the idle counterclockwise a little at a time until you get a more positive response from idle to full speed.



HAPPY FLYING