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Old 06-24-2011, 10:27 PM
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GearNut GearNut is offline
Motorized Bicycle Elite Member
Join Date: Aug 2009
Location: San Diego, Kaliforgnia
Posts: 5,106
Default Re: what did you do to your motor bike today?

Originally Posted by KCvale View Post
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.
Any thoughts?
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.
"It's a chinagirl. It's a sometimes fun little engine that often will break your heart. It's disposable.

Does not come with a fortune cookie."

Last edited by GearNut; 06-24-2011 at 10:38 PM.
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