I'm not sure on the cavitated fuel line question Pete, but if you remove the air filter for viewing, you'll see how engine vacuum will open the choke as you blip the throttle, even if the choke is fully closed.
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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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