That's not the first time I've heard a report like that, although it is the first for a scooter. Perhaps it uses a ball and spring in the cap (like a check valve) and the spring is too strong or the ball is gummed up. Can you do some surgery on it?
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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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