1965 Evinrude SportFour Heavy Duty 60 HP Outboards Service Repair Manual, P/N 4204, Page 47Get this manual
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WORN RING GROOVES WA RPED RING INSUFFICIENT GAP CARBONED RING AND GROOVE
Figure 5-23 Checking Fit of Ring in Cylinder
Figure 5-22 Cleaning Carbon from Ring Grooves cylinder b