ORIGINAL: Truckracer
Regardless whether the thing is rich or lean, it needs to have some basic checks done to see what the problem is.
I agree with that. All you need is air, fuel and spark to make an engine run or anything related to that.
As for the original question, "Does your DA 50 do this?" No, my DA 50 runs just fine whether it be inverted, sideways, up right, etc. I set my needles as lean as possible on the low end, and peak the high then back off a tad. It does not load up in flight, nor does it go lean in flight. There is still a little of the DA burble, but not much at all. Nothing wrong with mine.