2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 204Get this manual
POWERHEAD ASSEMBLY9.915 Apply Permatex No2 to the two ribs in the cylinder head next to thermostat water passageInstall the thermostat assembly (and temperature switch, if equipped) in the cylinder headInstall thermostat cover and O-ringscrews 60 to 84 inIbs(7 to Nm)Torque
Lightly coat both sides of new cylinder head gasket with Gasket Sealing CompoundInstall the gasket and cylinder headTighten the cylinder head screws in stages to the final torque of 216 to 240 inIbs(24 to 27 Nm), following the sequence shownInstall the cylinder head screws dryDo not use sealant on threads