Did you remove all of the jets ?
I removed everything with the exception of the dismantling the slide and needle assembles (I need to get new needle nose snap ring pliers to get in there) I did wipe them off with a carb cleaner soaked rag to remove debris, they felt smooth to the touch before reinserting.
I made sure that both spray carb cleaner and air went through all the ports and jets before reassembly
For future reference, the Yamaha carb cleaner is the very best
I have seen reference to this product in other answers and I will look for it in the future.
If you decide to remove the airbox
I guess I will have to live with the airbox as is, This bike is not a project I can afford to put the kind of money into that a new set of fancy carbs would cost, I am willing to buy some parts to tweek preformance but if I have hundreds or thousands to spend on this I would take it to the local shop and say go wild.
For your stock carbs, go two sizes larger on the main jets. Raise up the needles in the slides by 2mm
Where do I look to get new jets? Do I just take one of the old ones to my Suzuki dealer or is there a prefered shop online? How do I know what size jets I have acording to a manual I found online My bike had #112.5 main jets, #42.5 Pilot jets and #50 starter jets, does that sound right for this bike? If so what is 2 sizes would that be # XXXXX on the main jets?
Raise up the needles in the slides by 2mm
As I mentioned earler I have yet to disasemble the slide and needle assemble, The needles seem to have a spring or spring washer under them as I can move them a 1/8" I assume that 2mm washer in there will bring them up and I think I can figure that out just wanted to mention that thay are not completely rigid in there.
go up one size richer on the pilot jets
Same questions as about the main jets.
Now you will want to adjust all of the air screws
I dont have a shop tach, can I do these adjustments watching the tach on the bike or am I out of luck without a pro tool?
I think I understand the procedure described for adjustment of the air screws.
I currently have the screws at about 3 turns out, seems to idle well there and I can open the throttle without it bogging, but the idle seems is a bit high after reving then drops down a 1/2 second later, this makes me think my carbs are out of sync.
I dont have access to a 4 port vacume or mercury gage but I do have a vacume pump with a gadge on it and a friend should still have a 2 port mercury gadge I lent him years ago, can I check vacume on each cylider with the pump/gage and balance that way or work 2 at a time with the 2 port mercury gadge? I am trying not to buy a lot of tools I will not use again as this is a hobby not a profession.
Do not buy any of the jetting kits
I am always pleased to take the advide of a pro over that of a online shop trying to sell parts but the jet kits (specificly dyno jet stage 3 Link: http://www.motorcycle-superstore.com/1/5/90/30239/15392/PITEM/Dynojet-Stage-3-Jet-Kit-1982-Suzuki-GS750T-Parts.aspx) I have seen for my bike are about 100 bucks, and come with drill bits, instructions washers, springs needles, ect. Do I need to drill out the ports? is that kit overkill, I like to save money how much will 4 each main, pilot jets and washers cost me seems like that would be almost 100 bucks anywhere.