1993 Johnson Evinrude "ET" 60 thru 70 Service Manual, P/N 508284, Page 48Get this manual
Maximum Spark Advance Adjustment
Run the engine with the proper test wheelDo not run the engine with propeller or flushing adapter for the adjustment1Connect timing light to the No.1 cylinder spark plug lead
2Start the engine and allow it to reach normal operating temperature3Run the engine to minimum of 5000 RPM in FORWARD gear with timer base fully advancedThe engine timing mark must align with the correct degree mark on the flywheel gridSee chart below
Maximum Spark Advance 60TTL, 65RS,70TTL
PCE0021
LL partsLoosen cam roller screwRotate cam roller