"Typically a foreign particle (like the plumber's paste) can cause the flooding. Remove the foreign particle and the issue goes away."
+1
Difficult if not near impossible to tune the center carb unless you have the fuel level under control.
A good way to clean a needle/seat assembly is to shut off the fuel to the carb while the engine is running. This causes the float to drop and the needle to move away from the opening of the fuel inlet seat.
Right before the engine dies out, turn the fuel back on, and allow the incoming fuel flow/pressure to "flush" the needle/seat assembly. I've used this procedure countless times with good success when we test carburetors here. 9 times out of 10 this saves pulling the carb and manually cleaning out anything lodged in the needle/seat assembly. We can then complete the testing, then take the carb apart, blow out any debris, etc.
Back to those self-contained fuel inlet seat assemblies. Due to the way they are constructed, and function, they would be much more difficult to "flush" out using this procedure as the disk/valve doesn't move very far from the opening when the float drops, and it has more material around it blocking possible escape paths for the debris......Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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