1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Manual, P/N 507265, Page 44Get this manual
Throttle Plate Synchronization
rn 1Loosen from follower camcam adjustment screw and move cam follower away throttle
2Loosen carburetor lever adjustment screw on upper ca rbu retor3Rotate both throttle shafts slightly and allow them to snap shut
W 4Press
up gently on the adjusting tab and tighten the adjustment screw
5Verify that both throttle shafts begin to rotate at exactly the same timeCam Pickup Point
1Move the throttle cam and cam follower toward each other[] 2Tighten the cam follower adjustment screw when the cam and cam follower are just touching at the pickup markThe carburetor throttle plates must be closed The pickup mark follower
must point to the center of the cam
Idle Speed
1The boat and engine must be in the water under normal operating conditions with the correct propeller installedThe boat's movement must be unrestrainedThe boat must not be tied to dock or trailer2Start the engine and allow it to reach normal operating temperature3Check idle RPM in FORWARD gear with an accurate tachometer