1994 Johnson/Evinrude "ER" 2 thru 8 outboards Service Repair Manual P/N 500606, Page 147Get this manual
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f5l9 Take piston diameter measurementbottom edge of the pistonfl10
f7l1.1 The secondflrst
900 away from the
12 The difference between the two measuements is the out-ofr