Artisan, you described what a is tweaker exactly, then claimed to not be a tweaker

I don't know what atmospheric conditions you live in, but an engine should NOT need to be tweaked before every flight. You should definitely check to make sure that things are not out of whack, but you should not have to change the needle settings every time.

big max, I don't know where you get your information from, but bushing engines "a lot less trouble?" How so? How are bushing engines any less troublesome than bearing engines? I would think bearing engines are less troublesome, myself, because they turn easier from the get-go. Bushing engines tend to dribble vast quantities of fuel out the front, while a bearing engine is fairly well sealed against that. A bushing engine is junk when the bushings wears out, while a bearing engine can be rebuilt good as new by simply putting new bearings in.