The impact idea is a good one to try. If the broken off portion can’t be persuaded to come out it may be possible to get it to go further in. If you can get it to go in a few more threads you can then screw in a stud with some loctite to secure it as a replacement for the bolt. I have done this on a GPX250 and it worked fine. The bolts seem to be very soft on these bikes and you can almost feel them stretch as you torque then down. And as Linkin says above replace all the bolts and snug them down by hand rather than torque them.
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Perpetua Culpa Alterna Vagus
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