I think the 46NT has more power over the TT or 46FX because I tried all 3 in a model. The Evo feels more like a 55 compared to the other two. Again, you have to use a hot plug to burn all of the fuel air mixture effectively. About half the people who talk about Evolution engines don't believe this. I picked up a $20 46NT last year from an owner who gave up. Guess what plug was in it when I opened the box. An 8.

I don't know if I got one to idle that low. To be honest, I never checked these past 7 or 8 years. I really don't idle my 4 strokes below 2000 even though they will, but while sounding neat they will quit from time to time such as on long approaches. What the Evo carb will do is idle for 30 seconds and then take WOT opened as fast as possible. That is something I can use when flying. I don't fool with pinch tests or holding the nose up. I just use my watch and idle for half a minute and listen to what it does when shoved wide open. The Evo carbs are good enough to tune off of that test and then go fly without ever worrying about power or deadsticks.

I got a lucky in being able to compare 6 of these engines when the boss at my part time job had me buy 6 46NTs.

Jeffie, what are the obvious reasons for Boca bearings? I'm missing out on what you mean.