I guarantee that the interior of the muffler is rotten. They start from the inside and work outwards.
I'd try the '86 gasket, but have you measured the '84 gasket OD? You should be able to confirm whether or not the '84 gasket would work.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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