2004 SR Johnson 4 Stroke 9.9-15HP Outboards Service Repair Manual P/N 5005655, Page 128Get this manual
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POWERHEAD CYLINDERCRANKCASEPISTON ASSEMBL
Service limit: If exceed service limitReplace Piston and
0.0020.013 (0.000080.0005 in) 0.040 (0.0016 in)
Piston pin
Conn