Hi Max,
I put a carby off a GCV135 Honda motor through the ultrasonic, I couldn't undo the main jet beforehand but it came out easily after being through the bath. I cleaned the tube holes after the bath because they hadn't cleaned properly and everything looks ok but when I put it back on the motor, it runs smoothly but only with full choke. The gaskets look ok so I don't think it is sucking air anywhere. The carby off the ATV worked fine after going through the bath. I also tried a whipper snipper one in the bath but that didn't seem to fix that one either. Any thoughts?