I had a problem similar to that and the problem was that the hose that goes to the diaphram actuator (sits behind the throttle mechanism on carb and shares a T with the line the works the fuel petcock) was pinched. Damn thing drove me nuts trying to find it. The way I did find it was I took the air intake off to where I could look down the throat of the carb and actually SEE what it was trying to do. In that case, the slide wasn't going up like it should. The fix was I took that hose out of the round metal clip that it runs through. It was causing the line to pinch and not giving it what it needed vaccuum wise. Try that but your description fits too large of a pilot jet. Happened to me when I tried to use a small drill bit to clean the jet.
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