Mercury 10/15 Sea Pro/Marathon - 6/8/9.9/10/15 HP User Manual page 59

OPERATION
2. Squeeze the fuel line primer bulb several times until it feels firm.
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3. Set the lanyard stop switch to "RUN" position. Refer to General
Information - Lanyard Stop Switch.
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4. Set the throttle grip to start position.
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5. Remote control models - Move on/off switch to the on position.
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