2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Repair Manual P/N 5005638, Page 196Get this manual
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POWERHEAD INSPECTION
IMPORTANT: If cylinder is outside these tolerances, it must bored oversizeoversize piston is availabIe for this engine 0.020 in(0.508determine oversizeadd 0.020 in(0.