1994 Johnson Evinrude "ER" 90 LV 120 thru 140, 185 thru 225, 250, 300 Service Repair Manual P/N 500612, Page 395Get this manual
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Spool Valve Shimming
4 To find the nominal side gapsubtract dimension from dimensionand divide by two: -
5 Remove the locknut and washers from the spool valve Save the washers