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I had a 6hp that would bog down at anything above idle…basically running way too rich. Make sure somebody didn’t plug up one of the air vents in your carb. With mine, it happened to be the high-speed air vent. I unplug the fuel line and let it run out of gas and it would run totally fine at all ranges for a second or two before dying off.
Your carb could have the low-speed air vent blocked. Make sure it isn’t plugged up – this would lead to a flooding at low speed, yet your high speed is working OK…right? The only way I figured it out with mine was holding another 6hp carb next to the suspect one, somebody had put a lead shot over one of the vent holes and plugged it inadvertently.
You might want to fish a thin wire down those holes and make sure they’re not plugged…just don’t put one down the orifice holes and ruin either the low or high speed orifice!
Joel
Sure do remember your carb, glad we stumbled on that problem!
In any event, I agree that a flooding engine surely picks up RPM as the carb runs out of gas. But, in this case the poster feels the engine is running on one cylinder and somehow flooding the other cylinder, he goes on to report that RPM comes up/other cylinder kicks in, as the carb runs out of fuel. To me, it is very unlikely that a flooding carb would affect just one cylinder, and that is why I am questioning this theory.