carb diaphragm

I'm in the process of tuning up my BS34 carbs following the carb bible "The XS650 Garage Carburetor Guide.PDF". I've noticed it is running a bit rough when I apply throttle. I popped the air pods off to see if that would help. When I looked in the air intakes, I was surprised to see the slide...

My '83 is my 'go to' bike for daily riding. It's done and needs no more, mechanically speaking. The '77 was done mechanically too but became a parts tester when I acquired the beaten and abused '78, and in the process of getting the '78 road worthy the '77 wound up with the '78's carbs. I had...

Removed my Carb off my 1980 XS650 and pretty sure it is a Mikuni BS34. However, the float bowl doesn't look like all of the diagrams I see for the BS34. Can someone help assure me that this is a BS34 and help find a correct diagram, been going round and round about this. Thanks! See pictures:

Anyone know why the retaining disk would move up the piston wall, and get stuck? Causing the needle to jump out of the slide? Any help would be appreciated. Here is a pick.

Does anyone have any pointers on how to ensure that the carb diaphragms are seated properly all the way around circumference (including tab) just prior to putting on carb hats? I have new ones from Mikesxs and when trying to secure the ridges around the circumference, they just don't want to...