2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 31Get this manual

2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 31

PERIODIC MAINTENANCE SPARK PLUG
SPARK PLUG
INSPECT EVERY 100 HOURS (6 MONTHS) REPLACE EVERY 200 HOURS (12 MONTHS)
Standard spark plug: NGK DCPR6E

SPARK PLUG GAP

Using thickness gauge, measure for spark plug gapIf the gap is out of specification, adjust it to within the specified rangeSpark plug gap: 0.80.9 mm (0.0310.035 in)

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