1969 Evinrude 40 HP Big Twin, Lark Service Repair Manual P/N 4596, Page 9Get this manual
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CLEARANCE CHART POWER HEAD Piston and wrist pinloose end Piston ring gap Piston ring groove clearance Cylinder and piston .0006 Max- .0001 Min.017 Max- .007 Min0045 Max- 0020 Min.0045 Max-.003 Min,