You can think what you want to think. All three gave me the same problems. And they were all looked over by pro's. We tried different fuels, with no avail. On my 100, it was on the Excelleron 90. I had that engine plane combination for about four months trying to get the thing to run long enough to get one complete flight out of the plane, but never could. It would start, but not tranit to full throttle. Then when we thought we had it ok for transit to full, it would not idle back properly without shutting down. When we thought we had it running good for all throttle settings, I would put the plane up in the air only to have it die after three or four orbits.

At first we thought it was fuel, then thought it was something wrong with the fuel line or tank. We swapped out glow plugs. Removed and checked the tank and fuel lines. Then someone suggested a new carb. So, someone brought a new carb in (this carb cost over 80 bucks) and it worked out ok, but that takes away from the reason I bought the EVO to begin with.... cost. If I wanted to pay that much for an engine, I would have bought an OS, which I eventually did.

I put an OS 1.20 AX on that plane, and after break in, and after changing NOTHING on that plane after all I had done previously.. not the fuel line, not the tank, nothing.. it flew just fine and still does. The very first tank after break in was the first time I flew that Excelleron 90 for a full 12 minute flight.

By the way, the 46 did the same thing after I had it running, what I thought was just fine on a different plane. It ran fine for about 5 tanks then it started with the same thing as the 100 did. Then when I tried to run the 60, well, that was a ditto of the 100. They just would not run right. It was extremely frustrating because I would have never figured that all three engines would give me the same problems.

I have a Super Tigre that runs great. Leaks a little fuel from the needle valve guide, but other than that, it runs great. And, I have one OS 40 LA, three OS .46's, one OS 50, one Super Tigre 75, and three OS 1.20's. All start perfectly (as you say, one flip) and run just fine, and are very easy to tune.

Sorry, but no more Evolution engines for me.

DS.