2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 16Get this manual
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GENERAL INFORMATION SERVICE D Data
Piston ring free end gap
STD Limit
mm(in) mm(in)
STD Limit
5.9 (0.23) 0.020.06 (0.00080.0024) 0.10 (0 .0040