tuning

When I pull up on the choke, the butterflies close and it idles higher. Push the choke down, the butterflies open, and it idles lower. This makes no sense to me. As a side note, the bike already idles too high (4500-5000) so I know the carbs need tuned bad. I’m just confused as to how...

OK...so I've been working on my '75 and I thought I had it running great. I take it out today because its a beautiful 70 degrees and sunny here in south Texas today and I get it up to about 65-70 mph and it just acts like its starving for fuel...no power,kinda sputtery but if I reach down and...