2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Repair Manual P/N 5005638, Page 199Get this manual
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POWERHEAD ASSEMBLY9.915
IMPORTANT: Gap of the ring must tioned opposite notch in the piston
Wrist pin washer
1 Gapretaining ring 2 Notch in piston
1 Needle