1992 Johnson Evinrude "EN" 9.9 thru 30 Service Repair Manual, P/N 508142, Page 160Get this manual
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If any cylinder is outside these tolerances, it must be bored oversizeOne oversize piston is available for this engine (0.030 in 0,762 mm)To determine oversize bore add 0.030 in(0,762 mm) to the stand