2002/2003 Johnson SN/ST 2 Stroke 3.5, 6 8 HP Outboards Service Manual, PN 5005466, Page 59Get this manual
MAINTENANCE SYNCHRONIZATION AND LINKAGE ADJUSTMENTS68 of the amplifier begins to moveThen back off the screw 18 turnRemove amplifier and reinstall air silencer
Maximum Spark Advance
No maximum spark advance adjustment is necessaryCorrect ignition primary lead position is all that is required to maintain proper ignition timing on 68 HP modelsOrangeblue lead must connect to top ignition coil
Idle Speed
The boat must be in the water, under normal operating conditions, with correct propeller installedThe boat's movement must be unrestrainedThe boat must not be tied to dock or trailerBefore proceeding, be sure the low speed needle is properly adjustedStart the outboard and allow it reach normal operating temperature Shift the outboard into FORWARD gearRapidly advance the throttle to wide open position (WOT)If outboard stalls or backfires, the idle mixture is too leanTurn the slowspeed needle 18 of turn counterclockwiseRepeat procedure as neededTurn the idle speed knob fully counterclockwise to the full SLOW position