2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Repair Manual P/N 5005638, Page 129Get this manual
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IGNITION SPARK PLUGS
Recommended
OL77JC4
IMPORTANT: Use of non-suppression spark plugs will cause ignition probIems
Flywheel Holding Tool
FLYWHEEL SE