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Leaky exhaust

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What kind of seal do you use between the header and muffler?  I've got a air leak on the exhaust of my 08 kx250f...

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Iv never had an exhaust that had a seal there. The head pipe goes into the slip on. If it's an exhaust leak it's your head pipe or your can needs repacked. Is it back popping on decel?

09 yfz450r

09 kx450f

Edited by dirtsurfer614

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I just put on an fmf pipe on my bike and they recommended high temp silicone. I used perma gasket black and put a thin layer. No leaks.

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The stock pipe has a gasket/seal that goes into the silencer side which makes it fit tight over the header so the clamp can hold it and not leak.

 

I dont use aftermarket silencers so not sure about them.    

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