Originally Posted by KCvale
Extreme heat can and will cause problems.
Note I have a Black Skyhawk motor so that may be a factor, but spit shouldn't boil on the carb's float bowl when I stop.
Yes. Almost every motorcycle I have worked on that had a flange mount (bolt on) carburetor and manifold, with the exception of the Honda CT70, had a brown or black heat insulator in between the cylinder and intake manifold.
It is there to help prevent heat transfer from the cylinder to the carburetor.
An intake gasket by itself will not block the heat transfer, soooo.....
I am thinking of making one for my little beastie.
Someone on this site posted the name of the material that the heat block is made of. It looks like it is made of fiberglass mesh and brown resin, although it is not.
Edit: I searched for it and all I could find was "phenolic heat insulator", which looks to be the correct material.