Thanks for the great reply.

It might take me a couple days to pull the engine and make a stand for it and dedicate a couple hours to it, but I will, just as you recommend.

I really don't think there's anything mechanically wrong with the engine.... Why? Ummmm, I dunno. It just runs so smooth, sometimes.... Ok rarely, but sometimes.

Maybe I've put so much time in this thing that, running it on a stand is exactly what I need.

I'll check on RCU, but what level should the tank be? Stopper in line with the HS needle? Cluck in line with the needle? What do you recommend? Not that there's anything I can do about the tank, you are right. It fits tight. I expressed a concern about no foam between the tank and the frame, but the guys at the field said don't worry about it. And they had the planes to prove it. So I haven't. There's no wood I can cut out for foam unfortunately. Maybe I can run a smaller tank. I think I have an 8oz at the house.

One thing that has always bugged me though. The engine seems to dump a ton of raw fuel out of the exhaust even when it acts like it's running lean. It's happened on all the fuel types I've run though it (maybe except a full synthetic 15%, I'm not sure)