1987 Johnson/Evinrude CU Outboards 35A thru 55 Service Manual, Page 65Get this manual
Synchronization and Linkage Adjustments Remote Control Models
INote lit is important that this step-by-step procedure betofollowed in sequence and be performed exactly as written ensure
consistent engine idling and smooth operation throug hout the RPM range
INote performing remotefollowing synchronizations before Remove both control cables from the eng ine the and
adjustments
Throttle Valve Synchronization
INote carburetor engineadjustment screw resultsIf inloosening idle, With the idling in NEUTRAL: the lever better
improper synchronization of the throttle valves is indicatedAt idle, all throttle valves in each carburetor must be completely closedIf the linkage between carburetors is misadju sted so that one carburetor has the throttle plates slightly open, th is will result in erratic idle and poor quality idle
1Place throttle control lever in idle position Loosen the throttle cam roller screwPush the throttle cam roller away from the throttle cam The throttle cam roller must not touch the throttle cam 2Loosen the upper carburetor lever adjustment screw