Go to Napa, buy some gasket material. Trace the shape of the flange on the gasket material and using a small hobby knife, cut out the exahust hole and bolt holes. Using some permatex gakset maker and coat both sides of your new gasket. Install, torque nuts on exhaust studs, and ride.
I heard some of you make gaskets out of cardboard, the squished kind of carboard which has no holes, correct? I found a good 2 millimeter thick piece. which is a good deal stronger than the "cereal box gaskets" I heard of, if indeed they are made out of cereal box cardboard.
Would I just cut it out, install, and go? or use some of that sealer I hear about. Also, is this sealing stuff available at an autozone?
a tip for both exhaust and intake: one reason the gasket blows is because the flange isn't exactly flat, put a flat file to it & clean it up before re-install, since doing this i haven't had to re-replace either gasket.
Well I rode it around all day at around 40+ MPH with no problems from the exhaust, engine ran pretty cool as well the whole time.
Also saw another motor biker with some honda four stroke mounted in his red beach cruiser, he could only do 20 tops, haha. He was amazed with my engine, as he never seen another one before. Thought that was pretty cool.