you probably just need to yank the balancer and retap it.
this is a great time to get a new balancer if you have not (and avoid tapping).
the stockers suck if you ever rev much. i know of many horror stories. really check the elastomer (rubber O-ring around the middle of the balancer). if it has cracks or the balancer wobbles (or you cant keep time), double check it and replace it.
good luck.
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