1998 Johnson Evinrude "EC" 25, 35 HP 3-Cylinder Outboards Service Manual, Page 41Get this manual
2To adjust, loosen the timing adjustment screw nutTurn the screw to align the mark on the crankcase with the correct number on the timer base grid Turning the screw clockwise one turn retards the timing approximately Turning the screw counterclockwise one turn advances the timing approximately 23Tighten nut Verify the adjustment by opening and closing the throttle several timesMake sure the mark on the crankcase consistently aligns with the correct number on the timer base grid when the throttle is in the wide-open positionWide-Open Throttle
[] 1Remove the air silencerAdvance the throttle to the wide-open positionVerify that the throttle plates are horizontalIf not, check the linkage for correct assembly, mechanical binding, and interference[] 2Attach the drain hose to the air silencerInstall the air silencer on the engineNeutral Detent Adjustment ]1While rotating the propeller shaft, move the shift lever to NEUTRAL position