Hello everyone, stupid question here. 
So I was pulling the carb off my bike because it wasn't running right and when I took it apart, I looked down the main jet and the pilot jet to see if it seemed to be blocked. I then walked across the shop and when I looked back in the main jet (I think), it seemed like it was much more open than I remembered. Now I've convinced myself that I've dropped some critical component out of the carburetor onto the shop floor. Can I get a sanity check here and can one of you more experienced guys let me know if I've actually messed something up or if I'm just losing it? Thank you all.

photos.app.goo.gl/cWZeXyAPq75TYA1U8

That should really be the "jet setter" with the o-ring to seal into the well in the float bowl.   It looks like a main jet with a HUGE hole like someone drilled it?  I also don't see the thick brass washer that should be under the jet setter. 

Main jet goes on end of jet holder that threads into side of float bowl. 

The brass washer, which fits under the main jet, and secures the needle jet into the carb body, is missing. If you can't find it, a replacement should be easy to obtain.

I'm guessing it's a DT2 & washer #6 looks to be missing 'as MarkT & Yam-Fan says' but not easy to get a good look.
Also be sure to have the Oring #7 that fits onto #5 & seals into the bowl. Yours has a side mounted main jet in the bowl & #5 seals the needle jet extension into the bowl so it can suck from the main jet which sits in item #9
www.partzilla.com/catalog/yamaha/motorcycle/1972/dt2/carburetor
Just another thought--if you've had the needle jet out then be sure it's located'right where we're looking in your pic' as carb has a pin to locate the needle jet in 'that' fat bit to the right of your pic. If you've missed that, then the airway could be mis-aligned but i doubt that's happened as needle jet wouldn't sit all the way down & would sit on the pin.

Yes, thanks RT325...  I looked at it on a bigger screen and that could be a jet setter with the oring groove...  don't see an oring and with straight on view hard to see the round end, looked hex all the way on a tiny pic.