1983 Yamaha 30EN Outboards Service Manual, Page 40Get this manual

1983 Yamaha 30EN Outboards Service Manual, Page 40

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Functions of the carburetor Fuel low when the choke is closedWhen the choke is closed, the airflow is restricted by the poppet valve in the
Air Fuel Mixture
$1 Main jet 2 Main nozzle 3 Pop