Mercury 300 XS OptiMax Manual page 69

5. Shift the outboard to the neutral position.
6. Do not advance the neutral fast idle speed feature on the remote control
for starting (if equipped).
7. Turn the ignition key to the "START" position. Release the key when the
engine starts. If the engine fails to start in ten seconds, return the key to
the "OFF" position, wait one second, and try again.
8. Check for water coming out of the water pump indicator hole.
NOTE: The electronic starting system will automatically prime (choke) the
engine and increase idle speed for starting.
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