1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Manual, P/N 520210, Page 101Get this manual
6To 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 4If the engine does not respond properly to these adjustments, check the following: Engine temperature Linkage adju$tment External recirculation system Sufficient exhaust back pressure
Important
Intake Manifold Servicing
Removal 1Follow steps listed in Carburetor Servicing and remove the carburetors
2Remove the two balance tube retaining clips from the crankcase flange