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That is the only thing left that it can be. I don't know what else it can possibly be, I'm running out of things to replace. I plan to take original carb apart tomorrow and clean it out and throw it back on engine to see how it runs.

I do not see anywhere to adjust the air to fuel ratio on this carb, is there supposed to be a place to do it?

I adjusted the valves, much easier than I anticipated. They were not far off from spec. Engine still spits and sputters.

Thank you! That is a bit over my knowledge so I will have to send it to a repair shop for that.

I have the following engine in my ride on mower https://www.engine-specs.net/briggs-and-stratton/40h777.html a 40H777 22HP V-twin and I can't get it running smooth. I have replaced the following with no success in fixing the problem. What am I missing? carburetor fuel pump fuel filter air...