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Anti Freeze in header

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my friend has a 98 250 exc and he just did a top end a year ago, didnt even break the new top end in before the tranny got locked in 5th gear. Its been in the garage since. We took it apart today and upon taking the header off found that it was full of antifreeze. Does this mean the top end is bad? Could it be tranny related? We are stumped, were just going to keep pulling it apart and see what else we can find.

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