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Running rough after top end rebuild

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I just put a top end (piston, rings,gaskets) in an 85 JR50. it had no compression and evidence of blow-by when apart. The exhaust pipe was very clogged (couldn't hardly blow through it when removed) but I put some carb cleaner in it and made it better. now, it is back together and has lots of compression, but runs horrible. It is leaking at the gaskets. Could the exhaust pipe not letting enough air through cause the gaskets to blow out? it would at least idle before when it had little compression. it won't idle at all now. Thanks for any help you can provide.

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clean out the exhaust a torch and wire brush and a long flat head will help you do this,

did you tighten down the head bolts to torq specs?

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i also once had a pw50 pipe that was so bad i had to soak the end of the pipe in berrymans carb cleaner overnight scrap and brush then soak again overnight to clean out, also make sure the cylinder head portis free of all carbon deposits

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