Anyone used an ultra sonic cleaner for carbs? Usually just a good soak in carb cleaner and I'm good to go. Sometimes there is that stubborn particle that is left behind and while browsing through my latest Harbor Freight catalog, I saw one but think it is quite small for most carbs. Anyone here using one and could recommend a reasonably priced model that can fit an average carb. Definitely don't need an industrial type unit as this is not something I need to use often.

The larger one from HF goes on sale often and is a reasonable piece of gear that should fit one of your carbs. I would be VERY cautious about putting carb cleaner, degreaser, etc in it with a carb in the pot. The real advantage that the thing brings is that it is shaking the junk out and does not rely on the solvents doing the work. Maybe dawn dishwasher soap, but someone who is smart may have a better idea. They can really work well getting the minuscule parts out of the float linkage, jets, etc. In your rotax, the most logical point of failure is the floats. Learn to do the float failure (sinking) test with a scale and you will most likely figure it out. Or you can just take the bowls off and see which one is lower. good luck!

Thanks silflexer! I picked one of the 2.5 liter models at the HF while I was in Fargo for a VA appointment. Didn't have much time so I grabbed it and came home. Not sure if the basket will be large enough for a carb but will test it out today.
I posted the question on a couple other sites also, and I had responses of pros and cons. The only con I will worry about is the one about the cleaner knocking out an epoxy plug over a passage plugged with a steel ball. Not really a worry as I am sure I can figure out how to reinstall and fill with epoxy again if needed.

I'll give the cleaner a try with a couple of motorcycle carbs I am rebuilding for an old collector bike, I will post my findings if anyone is interested.

I don't know how it would work for Carbs, but used one for years for injectors!!
Instead of HF it was HM!!
Attached a tuna fish can to the double sided upright grinder and filled with Hoppe's #9 powder solvent and then turned the grinder on!
If you had a ridgid container that would hold your carb and attached it to the grinder, should get the GOD VIBRATION's your looking for??

Ultrasound works great on carbs. You can use the safe (non flammable) parts washing fluid (just a strong surfactant) instead of something that might go !poof!

Water based solvents tend to perform better in sonic baths that are able to cavitate than light hydrocarbon solvents due to the unusually high cavitation pressures that water provides. If you are not cavitating, solvents often outperform water based solutions.

You can repeat with distilled water and ivory or dawn, and then just distilled water to make sure the sludge is gone.

A good sonic tank can often do the job in about 15 minutes per bath.

PineSol in the HF cleaner works very well, and doesn't eat parts away.

I second, and own and use everything the others are already talking about. Cheap and effective