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Need fix for exhaust leak at header

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I just did a top end re-build on my 2002 YZ250F. When I had it apart, I cleaned it, took out the old seal from where the head pipe goes into the head, and replaced it with a new one when I put everything back together. Now I have a leak. I tried putting back the old seal and still, leak. I did notice when I was cleaning where the head pipe goes, it was a little pitted. I think that cleaning it got all the dirt and carbon out of the pits and created my problem. The question is how do I fix it? Obviously, the seal is not going to do the job anymore.

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