1995 Johnson Evinrude "EO" 90 CV 85 thru 115 Service Manual, P/N 503150, Page 40Get this manual
Maximum Spark Advance
INote Run the engine with the proper test wheelDo not run the
engine with propeller or flushing adapter for the adjustment
1Install the spark plugs and connect the leadsConnect timing light to the No.1 cylinder2Start 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 thru 115 28 BTDC
PCE0026
& 4Stop the engine to prevent contact with rotating partsTo
Loosen the locknut on the spark advance rod Rotate the thumb wheel to correct the timingRotate top of thumb wheel toward the crankcase to advance the timing Rotate top of thumb wheel away from the crankcase to retard the timing