1998 Johnson Evinrude "EC" 90, 100C, 105C, 115, 150, 150C, 175 60 deg. LV Service Repair Manual, P/N 520210, Page 41Get this manual
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Idle Timing
90,100,105,115 150, 175
4 ATDC ATDC
9 To adjust idle timing, hold the timing wheel in positionHold the inside detent tab in position against stopMove