1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 44Get this manual
Throttle Plate Synchronization f21 1Loosen carburetor lever adjustment screw on upper carburetor2Rotate both throttle shafts slightly and allow them to snap shut t:I
f31 3Press up gently on the adjusting tab and tighten the adjustment screw 4Verify that both throttle shafts begin to rotate at exactly the same timeCam Pickup Point 1Move the throttle cam and cam follower toward each otherf4l 2Tighten the cam follower adjustment screw when the cam and cam follower are just touching at the pickup mark The carburetor throttle plates must be closed The pickup mark must point at the center of the cam follower