That could be a failure mode of the CDI. More commonly, a failed CDI will still allow the bike to start, but it won't rev properly.
I've had bad CDI's, bad coils and bad coil wires.
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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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