1987 Johnson Evinrude "CD" Colt/Junior thru 55 Commercial service repair manual, P/N 507546, Page 226Get this manual
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The major diameter for standard size piston at the skirt should not be less than 2.9940 in(76,05 mm); .0240 in (76,81 mm) for an oversize piston Measure the piston several more times; 18 to 1 in(3,2 m