Here is what happen to me. The front squirter started leaking at around 2k RPM. It showed up on the front spark plugs 1,2,3,4. The carb builder advised to put in a P/V.
I got advice in here about taking a draft hammer an very lightly tap the pin to reset the seat. I have not done that yet.
I noticed the leakage got worse when i ran ethonal.
Hope this helps..