1998 Johnson Evinrude EC 50 thru 70 HP 3-Cylinder Service Manual, Page 94Get this manual
5If the adjustment is too rich, notice your reference mark and turn the needle 1fa revolution clockwiseWaiting 15 seconds after each adjustment, repeat this procedure until you reach the highest consistent RPM
6Repeat Steps thru for each carburetor7To test your adjustment, run engine near full throttle for three minutesReturn the engine to idle in gearThe engine should maintain smooth idle RPM If your test results vary, repeat Steps thru 5If the engine does not respond properly to these adjustments, check the fo"owing: Engine temperature Linkage adjustment Internal recirculation system Sufficient exhaust back pressure Intake manifold balance passage
Important
Intake Manifold ServicingAll Models
Removal