The diaphragm is in the fifth picture of the link you shared. It's a CV style carb, so the needle isn't directly acted upon by the throttle cable. You're opening the butterfly and vacuum is lifting the needle off of the seat.
Glad to hear that the new carb got it running.
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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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