Hey Kolby how's it going =) how you getting on with those carbs? I looked around for a ultrasonic cleaner as well when I was working on mine but came up short. Figured I'd go the manual route instead - bought a few bottles of Pine Sol (the original green one - not the lavender scented one) and soaked then for about 24 hours. No need to boil them in pinesol, just soak. I broke up the carb bank and soaked each carb in it's own little bath, they came out great. One thing I learnt doing this is that not all the parts on my carbs liked the pinesol however, namely the vacuum valve thingy on top of one of the carbs that acts as the fuel intake from the petcock. This part (on my carbs at least) is made from a pot metal that reacted with the pinesol. Got it out of there before any damage was done, but best to remove it beforehand.
Once I'd soaked them I then completely disassembled the carbs (I purchased a manual from Mike Nixon - http://www.motorcycleproject.com - which proved invaluable, check out his website. Think it might be geared more to Hondas but there's a ton of great info on his site), bought a rebuild kit from Randakk's and got the things rebuilt. I don't have an air compressor so bought a few cans of compressed air from Canadian Tire (it's used for cleaning computer parts etc, costs about $10 a can) which did the job. A useful trick I learnt from Mike Nixon was to taper the end of the straw on the can of carb cleaner using some very fine sandpaper - this allows you to really jam the end of the straw into the tiny jet holes and passages etc in the carbs. Tricky getting the throttle and choke linkages reassembled if you do decide to break up the carb bank but doable.
Great to hear Stubby running, she sounds great! Good luck mate, see you on the 40...