Running it rich wont hurt it as much as running lean. Lean means excess heat, and in a tight new engine, which is already generating extra heat as the parts wear in, that can lead to damage. I have the same 2-4 stroke sound problem (newbie too). I opened it up until it ran rough, aka loping, sorta like a little harley engine. I then ran the 10 second sequence mentioned in the manual. I was told by my lhs owner that for the 46 ax, thats all it should take. I have, just to be safe ran abit rich for the first gallon of fuel. But when I dialed it in to "flight mix" It ran like a striped ape.