2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 57Get this manual
MAINTENANCE SPARK PLUGS
SPARK PLUGS
Remove and inspect the condition of the spark plugsReplace for the following conditions: Worn electrodes Cracked insulator Dirty or fouled spark plugs Replace all defective spark plugsBefore installing the spark plug lead cover on the spark plug, apply light coating of Electrical Grease to the ribbed portion of the spark plug ceramic and to the opening of the spark plug coverSee table below for recommended spark plug data and gap settingModels 3.5 68 Recommended Spark Plug
Champion QL87YC or L87YC 0.030 in(0.8 mm) Champion QL86C 0.030 in(0.8 mm)
SYNCHRONIZATION AND LINKAGE ADJUSTMENTS68
IMPORTANT: It is important that these step-bystep procedures be followed in sequence and be performed exactly as written to ensure consistent engine idling and smooth operation throughout the RPM rangeIf equipped, remove both remote control cables from the outboard before performing these adjustments