1993 Johnson Evinrude "ET" 90 degrees CV Service Manual, P/N 508285, Page 40Get this manual
Maximum Spark Advance
Run the engine with the proper test wheelDo not run the engine with propeller or flushing adapter for the adjustment1Install the spark plugs and connect the leadsConnect timing light to the No.1 cylinder
2Start and run the engine at full throttle in FORWARD gear with the timer base fully advanced
3The engine timing mark must align with the correct degree
mark on the flywheel gridSee chart below
Maximum Spark Advance
85 hru 115
PCE0026
i adjust:
the engine to prevent contact with rotating partsTo
Loosen the locknut on the spark advance rod Rotate the thumb wheel to correct the timing Rotate top of thumb wheel toward the crankcase to advance the timingRotate top of thumb wheel away from the crankcase to retard the timing Tighten the locknut and repeat Steps and 3Cam Follower Pickup Timing 1Connect timing light to No.1 cylinder spark plug high tension lead2Start the engineMove the spark advance lever until timing light indicates throttle pickup timing listed in chartAt that position throttle cam embossed mark should align with center of he cam follower