1996 Johnson Evinrude "ED" 60 LV 90, 115, 150, 150C, 175 Service Repair Manual, P/N 507127, Page 87Get this manual
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6 To 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 4 If