Hmmm...I'll assume you're referring to the eddy AFBs as being poorly calibrated slugs and not the AVS Thunder series. I tried to tune the stumble out of a borrowed Carter AFB comp (same as the eddy) and never got it right. Gave that thing back. Now I have an original AVS 750 and aside from needing a rebuild kit due to age...it still runs great. The eddy Thunder AVS carbs should be identical to the original with just a few improvements and more CFM (800). So to be clear...you're talking about the AFB eddys as being junk and not the Thunder series carbs right?? Cuz I was thinking about getting one.