ORIGINAL: 3d nate

Thanks guys for the great info.

The problem I have is when the low end is tuned right it will not die at idle, even when the butterfly is fully closed. I like the idea of trimming the butterfly though. I will have to run it again to make sure it's rich.

This was a conversion kit I had purchased and it did come with a constricting velocity stack, but I removed it and performance seems better. I have many engines, but I am new to a gas 4 stroke. I'm open to trying different mods because I am doing this just for fun anyway.

Great idea on trying different carbs. Yes it is a pumper and the stumble is when I hold it at about 30% power. I will run it again and tune out the stumble to make sure if I am lean or rich. The needles are about right but I can make a count on the turns as well. Perhaps my 4500 ft elevation has an effect?