W8ye, that's true, but these carbs are on gas powered equipment that I am selling to people, and they have to work properly.

I avoid using Zama carbs on airplane engines, due both to the lack of documentation on them, and the high cost of repair parts. Sometimes I use them and they work alright most the time, but given a choice, I put a Walbro on.

Sometimes the deposits in carbs that have sat unused for some time are very difficult to clean/remove without an agressive solvent like carb cleaner. This is the first time in many years of using it that I have had any problems. At first I thought tiny pieces of dirt were getting into those one way valves, but then I did a test, and sure enough, the carb cleaner ruins them... Live and learn!

AV8TOR