Mercury 300XS OptiMax - Flushing the Cooling System (Lower Unit)

OPERATION
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STARTING PROCEDURE
1. Lower the outboard to the "RUN" position. Make sure all the
cooling water intake holes are submerged.
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2. Open fuel tank filler cap vent screw (manual venting fuel
tanks).
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3. Squeeze the fuel line primer bulb several times until it feels
firm.
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4. Set the lanyard stop switch to the "RUN" position. Read the
Lanyard Stop Switch safety explanation and warning in the
General Information section.
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