Carb base gasket

[farm1810]

Hello all,
My CJ3A has the gasoline percolation issue in the float bowl.  I will run perfectly for about 20 minutes then just shut off.  Let it cool off, good to go.  The heat riser was stuck in the open position and I had my thought of how it worked backwards (thought it was stuck closed).  I freed it up, the spring is working (checked all with a heat gun).  Big improvement, but after about 40 minutes, same thing.   The engine gasket set I used had a carb gasket of about 1/16".  I don't think there is a vacuum leak, but it offers no insulation protection at all.  I looked on line and the gasket sold by Walck's is about an 1/8" think with what looks like a metallic slice in the middle of the two sides of fiber.  This is the one with the V shape metal defuser that installs down into the intake manifold.  I will receive that on Tuesday and install.  Anything else I should be looking for?  Other than this, it runs perfectly. 

[scoutpilot]

When you freed up the heat riser shaft did you verify that the plate had not been separated from its spot welds?

[farm1810]

I did not verify other that turning the shaft back and forth with the arm / weight.  Is there a way to verify without separating the intake / exhaust manifold?

[scoutpilot]

Rapidly raise and lower the "Lollipop" You should hear a clanging sound from inside the plenum.

[farm1810]

It doesn't "clank" it is more of a "scrunch" which causes me to think the flap is moving on the shaft.  Crap! 

[Chuck W.]

I am not sure about this, but before you start pulling the manifolds off, it may be possible to take the exhaust pipe off the bottom of the manifold and stick your fingers in and check to see if the flap is loose on the shaft. As I said, not sure about this, but worth a try, you have to remove the exhaust pipe anyway....

[scoutpilot]

He better have VERY long fingers.