If the suspension was bottoming with a child, a stiffer or longer shock is wise. That said, most dirt bikes have the very symptom you describe. They usually have a chain slider that wraps around the swingarm pivot point. It's a sacrificial part that requires periodic replacement. You could fashion one out of UHMW.
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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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