2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 115Get this manual
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POWER UNIT INSTALLATION Istll :
Cylinder head cover bolt: 10 Nm (1 kg-m, Ib-ft)
NOTE: Before installing the cylinder head cover, adjust vaveAdjustment
Adjust: Valve cle