The enya engines take a fair amount of time to break in. I'm curious as to how much static (break in bench)  run time you have on it? What prop and fuel are you running on the enya? I've had several that I have really enjoyed

Assuming Dane's point about break-in doesn't apply, and that you don't have anything weird going on, and that you're using a uniflow tank, then you need to shim the tank up.  If it's already tight against the bearers, you need to open it up and move the pickup up.

Also note, I read that wrong. I thought David said it leaned out both ways.  So my break in assumption may also be way off base

   You need to raise the tank. If you can't do that ...

I would raise the uniflow inside the tank before I started in on the rest of that -- it has certainly worked well for me, on a plane with a 46LA and a very non-standard spraybar position.

You should only need to move the uniflow, although on a typical tank it'll uncover sooner -- c'est la vie, at least things will work.

The enya engines take a fair amount of time to break in. I'm curious as to how much static (break in bench)  run time you have on it? What prop and fuel are you running on the enya? I've had several that I have really enjoyed

Okay Dane, your my new best friend. It ran better tonight. I made an angle adjustment on my tank and it seems like that must have been what it needed. On one flight it was hitting a fast four cycle at the bottom of each loop both inside and outside, but it ran dry after 3:30 with almost four ounces of fuel. Then it went dead lean the next flight and stopped after a minute fifty. Then I propped up to a 10x5 and it didn't like that at all. I went back to a 9x5.5 and removed my exhaust deflector and it we super rich and sputtered around for a few minutes until it ran dry.

It has about 50 minutes I would guess. Maybe 20 minutes on the bench and the rest in the air. I have the enya standard muffler on it and had an exhaust deflector too. If it wasn't a stunt plane it would be doing fine, but Im trying to squeeze some extra power for a nice pattern. I just keep going rich, then lean, with a minute or two in the middle where I do a couple stunts.
APC 10x4 was pretty good. Thundertiger 9x5.5 was just a little weak for the pattern. I'm running power master 10/22. I also switched to a hotter plug tonight which may have helped.

Maybe it doesn't like the 10% and I should try a 5%? Maybe it needs another hour break in. It says 2 hours on the instructions. Maybe it wants a tongue exhaust, which I think I have one that will fit if I can rig up a better strap.

I think removing the exhaust deflector helped. I prefer keeping the standard muffler if possible because I fly near houses and don't want to get them upset at me.

What effect does tongue versus standard muffler have? I thought maybe it wanted a larger prop, but the 10x5 just wouldn't hold a speed on the ground so I didn't launch.

Perhaps I can find an 11x4. Does it like a 424 break? I know many engines run better on a 2cycle.

Thanks

    As it has been said, you have to put about a gallon of fuel through an Enya before it gets near being broken in. Do all of that with no muffler and a smaller, flatter prop than you would fly it on. A 9-4 or 9-5 should do. You need to watch it carefully as it runs for such things as color of the exhaust residue, and pinch the fuel line every now and then to see how it peaks out and how it comes back to the needle setting. As it cools in between runs, look through the exhaust at the side of the piston at the top to see if a wear ring is starting to form at the top. That is a sign that it is getting to where you want it. Then mount it on a model and see how it runs. Put that smaller venturi on it, as it will help with fuel mileage and full draw for you. Take that exhaust deflector and throw it as far as you can into the tallest grass you can find so you will never find it again. Those things restrict the exhaust and make bad things worse. I really do not think an Enya .29 of that vintage will pull an 11 inch prop. Start off with the 10-5 and see where it goes from there. Make sure you have a good, hot plug in it also, and are using fuel with some castor in it, and at least 22% total oil. The lower 5% nitro will extend your run time, and if you put a filter of some kind on the venturi, it will help with fuel draw and run time also.  The last thing you want to do is to start changing a bunch of stuff all at the same time.  Things will get better with run time, and if you decide you really need to change something, just do one thing at a time, and don't change anything else until you have at least three flights on it with the last change. Once you get the engine broken in, and a set up for the model figured out, that engine will probably out live you.
  Type at you later,
   Dan McEntee

Ps.. the smaller prop with improve fuel draw dramatically. So a lot of issues will be cleared up by that alone

Okay, I put my break in prop back on it and did a few more bench runs. I can't take the muffler off  it's louder than a zenoah gas engine. Never heard of breaking I'm a motor this long. I'll try the number 1 Venturi and put my air filter back on and go from there. Thanks for the info.

Okay, I put my break in prop back on it and did a few more bench runs. I can't take the muffler off  it's louder than a zenoah gas engine. Never heard of breaking I'm a motor this long. I'll try the number 1 Venturi and put my air filter back on and go from there. Thanks for the info.

      It takes a very long time, I would guess several hours before it can be flown reliably, and 5-6 hours including flying it to really settle in.

    To first approximation, ignore where the pickup tube is WRT the spraybar, if it doesn't run the same each way, shim it, regardless of where it winds up. An excessively large venturi will definitly make it more picky, but even on something like a 75 running a tiny venturi, tiny shims can make a big difference.    David and Chip Hyde were out flying one time, and David suggested a tank shim. Chip was thinking about 1/4", David shimmed the tank 1/64, and *it was too much*. And it's not like Chip doesn't know a lot about model airplanes, he is one of the most accomplished modelers in history.

    Brett