hiI have two PHBG carbys ones a 19.5 and the others 21mm and DUDE your back in class . There is so many variants is not just altitude and atmosphere but how your engine setup is configured.
So I'm pretty good at it now, however it has taken quite some time to get to the point of fine tuning. So if you want to drop me an email and maybe swap phone numbers I'll share with you what I've got I've got several internet pages that I could forward to you and things like that and help you the best I can but it's just too much to do here.
just wondering on how this ended up im new to the PHBG carb as well any chance i could get the links you were talking about