1994 Johnson/Evinrude "ER" 60 thru 70 outboards Service Repair Manual P/N 500609, Page 153Get this manual
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s1 9 Use micrometer to check piston condition Make at leasttwo measurements, 900 from each otherMeasue the piston diameter 14 in (6,4above the bottom edgeRefer to Engine Specifications, Section 1, for