Exhaust leaking black oily gook

So I've been riding around my new creation for a couple days now (mountain bike w/ 80cc). I thought I tightened the exhaust plenty, and even locktited the nuts on, but burnt black oil is leaking out. I remember I had a 2stroke dirt bike years ago and the exhaust leaked the same way, but a bike mechanic said that it was supposed to do that. Is my 80cc supposed to drip gook out between the engine and the muffler? Or do I need to put on a better seal?

Also I smell like gasoline after every ride, but would rather not. Is this inevitable?

Hey Mike, I would suggest replacing the exhaust gasket with one made from better (thicker) material. I think I saw a thread showing how to make gaskets here somewhere. I have had the same problem on my dads bike, made a new gasket and that seemed to fix the problem. I need to do the same on my wifes bike and mine. I guess they all do that. Cheap China gaskets.

Does anyone know where I can get a gasket? Or is there a special type of rubber/material that I should cut a gasket from- I'm assuming any gasket material won't suffice because of heat and the gas/oil/other chemicals?
I bought two engine kits, could I just take the gasket from my second kit and put two gaskets on?

Advanced Auto, Pep Boys, or Auto Zone all carry different types of gasket material. A small roll cost around five bucks or so. There is a lot of material on a roll. Hope this helps. Good luck.

Don't use two gaskets together, especially if one is know to leak already.

Buy some gasket material and use the old gasket to mark out a pattern on the new gasket material and then cut it out.

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Fel Pro part # 70149 Egr valve gasket for Ford, $2.50
I found that it holds up better then regular gasket maker.

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great info there Fairracing.. That needs to be in the leave a tip section as well....

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Wow that's awesome! I was gonna send SeattleMike to Shucks - they have sheets of various gasket materials - including high temp stuff.

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Yes! You are the mang!

Thanks for that info!

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good find fair.

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