Wayne,

The 2 47's I have are the newer ones, both with the "tuned muffler". What gets me is, one has been flawless outta da box... , while the other is cutting out at full throttle. I haven't tried anything yet, but I will let you know what I find out with mine.

Both running the same fuel, same plugs, same prop (APC 9x8) and both mounted upright. Doesn't make much sense does it?

Glad you got yours running. If it came down to it, and I couldn't get it to run right....I'd probably take them both apart and check/compare everything before I installed a baffle. Ya just never know....I may end up doing what you did! lol

I DO know they will run as they come from the factory, so I'm sure my stubbernness won't allow me to go your route unless it's a last resort.

BTW, did you try relocating the pressure nipple and/or enlarging it? Perhaps there a burr/flashing in it or the muffler causing restriction? I'm sure you checked this, but thought I'd ask anyway. Maybe that's what I shoud do first....compare mufflers.

Gary