Thanks grumpy, I've read that thread before. I'm more so interested in how they'd perform cleaning residue from the smallest of carb jets, rather than just general parts cleaning. I know that many automotive workshops use ultrasonic cleaners for fuel injectors, but no doubt they're more specialised than the ebay units discussed in the other thread.
If the carburetors on these Suzuki's are particularly sensitive to any gunk or residue, they may be a good test for an ultrasonic cleaner.