I just scored a Fox 35 on Ebay.  I got it taken apart to add the by-pass burp plug.  It came apart ok with a heat gun.  It is well gummed up.  What is the best thing to soak it in to clean it?  RSM has back plate gaskets and a good needle valve assembly.  Where can I find a new head gasket?  Also it looks like it had two head gaskets.  Is this normal?

New fuel will clean it too as long as it turns over good, and the rod isn't stuck to the wrist pin let some new fuel soak into it oil it up good and run it, all the gunk will come out the stack , if your fuel is part synthetic it will work even better. If I have the engine disassembled I use straight methanol and a tooth brush. If your head gaskets weren't damaged in disassembly you can re use them. T.J.

Will the crock pot method harm an R/C carb on an engine?

Will the crock pot method harm an R/C carb on an engine?

It WILL harm it if there is rubber o rings or plastic parts!

Normal antifreeze will blacken an aluminum part.  When choosing your antifreeze, look for the aluminum friendly type used in the newer cars.  It will say eight on the front of the container.

oh yeah....blacken does not mean harm it.  It does not hurt the part, just darkens it.

I have used the green Prestone to de-gunk.  The Prestone never discolored any aluminum part.