Mdfogg,

I worked with several Evolution engines and have found no problems with them. My Evolution .61 is one of the strongest running .61’s I’ve ever run. Don’t listen to anybody who says they are boat anchors – they haven’t worked with any of the new Evolution engines.

I too don’t understand what you mean by “new body”. And did you replace the original needle valve assembly with the one for the NT .61? If so, you really should use the correct one for the .45 (the PTS engine is a .45, not .40).

I’m flying a .45 on our club trainer and it’s been chugging along with no real issues all season. I have no idea how much time is on it since it was a used plane that was donated to us, but its enough that it is starting to loose compression and the bearings are starting to make some noise. Several students of mine also have this engine and it’s a great runner – none have had any problems.

If you have bubbles in the line, this is an indication of vibrations getting to the fuel tank. The best remedy for this is to pack the fuel tank in foam rubber and make sure it has as little contact with any structure as possible.

Hogflyer