2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 72Get this manual
MAINTENANCE SYNCHRONIZATION AND LINKAGE
Wide-Open Throttle (WOT) Stop
Loosen the WOT stop screw locking nutAdvance the throttle lever to the wide-open positionAdjust the WOT stop screw until carburetor throttle shaft roll pins are vertical
Maximum Spark Advance
Connect timing light to the No.1 spark plug lead and mark the flywheel timing grid at 19 BTDCRun outboard with correct test propeller in test tank at minimum of 5000 RPM in FORWARD gearThe timing pointer at the front of the engine should align with 19 BTDC on the flywheelIf adjustment is required, stop outboard and remove the FORWARD socket from spark leverAdjust the length of the spark control rod by rotating socket clockwise to advance timing or counterclockwise to retard timingTwo revolutions equal approximately one degree of timing