1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 43Get this manual
Synchronization and Linkage Adjustments 40, 48, and 50 Models
must perform this step-by-step procedure exactly as written to ensure consistent engine idling and smooth operation throughout the RPM range
1Remove throttle cable from throttle lever 2Adjust length ofthrottle control rod It should be approximately 71316 in(19,8 cm) to the center of the socket3Adjust length of spark control rod It should be approximately 21116 in(5,3 cm), measured between the centers of the two socketsRemove the forward socket for adjustmentINotellf adjustment is required, use gentle prying motion to remove the control rod sockets4Loosen cam follower adjustment screw and move cam follower away from throttle cam5Adjust the idle speed screw until the spark lever cam follower is between the alignment marks Tighten idle speed screw locknut