The bigger Harbor Freight Ultrasonic cleaner only has either one or two transducers and as a result it has areas which are not as effective. It will only run for a limited time and you are not suppose to run the heater constantly. I bought one and used it on a pair of CV carbs off a 78 CX500 and it did a good job but, it took a lot of babysitting to restart it as its run time is low. I would run the heat for it's recommended value and that got it hot enough it was uncomfortable to put your hand in for a cycle or two. I ran it to the maxtime for the heat then I think the downtime was not more than X for Y time period. So, i would run it for two or three cycles and I repositioned the parts every cycle moving them so the ultrasonic waves were stronger under a different section I was cleaning, within the limits of the cleaners roomto do so.,
The Harbor Freight unit I have is not tall enough to fully immerse the carb body from throat to throat opening. I merely flipped them over then repeated the time.
You can see where the transducer waves are strongest by dipping vertically a sheet of Aluminum foil for a few minutes. It will have deformed and ripped the foil where it is strongest. You can then tell where to put things for maximum effectiveness.
I always used distilled water and tried to avoid any with added minerals, steam distilled will not have minerals and I believe most reverse osmosis systems also filter out the minerals and any particulates.
I would rinse them well with tap water followed by carb spray. Let them air dry and then bag them until reassembly. CLR used for couple minutes outside the ultrasonic will attack many hard to clean deposites of hard white stuff and any rust, lime, or calcium, etc.
Yamaha carb cleaner used to be fantastic stuff until they reformulated due to epa rules. Do not know if they refined it since I was last in a discussion about it.
What brand are those you link to? I haven't been able to follow the link to ebay on this device... will try to recall to pull it up when on the PC.
Looks like a nice unit.
David