The PTS engines on my PTS P-51 and my daughters Alpha 40 have been reliable and relatively easy to deal with ( the Alpha's engine never seemed to "walk" as badly as it did on my PTS P-51 ).

Another Evolution .46 has also been wonderful.


My Evolution 1.00NX has been a horror show!

I replaced it's carb with a new one, but I've always have had problem.

I've given up and I just put in a SuperTigre carb on it, that I had on hand.

I haven't flown it yet, but anything has to be better than the 1.00NX carb.