1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Manual, P/N 507265, Page 43Get this manual
o DR5123
Synchronization and Linkage Adjustments 40RS, 40, 50SPL, and 50
You must perform this step-by-step procedure exactly as written to ensure consistent engine idling and smooth operation throughout the RPM range
Preliminary Adjustments
1Remove throttle cable from throttle lever
2Check length of the spark control rodmeasuring between centers of the two socketsLength should be: 40R, BA; 50SPL 40E, TE, TL, TTL 50BE, TE, TL,JE 4-Amp System 12-Amp System in(50 mm) 2'2 in(64 mm)