I had the same problem. Mine was in the idle circuit and wasn't the easiest thing to solve.
The fuel passes from float bowl down to the idle jet, from the idle jet, the fuel goes up to the top of the carb. There is a air bleed at the top where air is mixed with the fuel, I thought mine was clean since spray cleaner was coming out and I could blow air both ways.
At the air bleed, the fuel makes a turn and is now headed away from the float bowl. As the fuel makes it way across, there is a very small hole, maybe .020" or so drilled in a brass slug. Once through this hole, the fuel turns again and is headed back down to the idle adjustment screw.
To access this brass slug and small hole, you have to pull out a lead plug towards the top of the carb. Remember the fuel goes up, across, and back down, to form a upside down "U". The problem is in the cross drilled hole.
I was able to use a screw to pull the brass piece out, then clean it and the bored hole out. Once clean, mine ran perfect. Go easy and try to clean the hole first, before pulling the brass piece out. I had no other choice, I could't get it cleaned and the hole is so small, no wires would go through it. I reinstalled the brass piece.
I used a lead tire weight, and cut off a piece, then trimmed it up and replaced the plug I drilled out. It was just shaped like a wedge, and I drove it in.
Joe
Last edited by Joe H; 10/09/2014 3:23 PM.
