The mating teeth have worn (and it doesn't take much) and the spring could also be weak. Not a difficult repair, but you're in for a handful of parts and an hour or so to get it sorted.
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Steven Beane #275
PlusOnePerformance - Superior Service the World Over - Dearborn MI
AMA District 14 (Michigan) Officer
afterhourscycle.com
Michigan's Beta and TM Race Headquarters
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