2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 36Get this manual

2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 36

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PERIODIC MAINTENANCE IDLE SPEED
the outboard motor
2 Attach the engine tachometer to the spark plug high-tension cord Engine tachometerCheck the idle speedIdle speed (in neutral): 1050 -11