2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 158Get this manual
4-20 ENGINE LUBRICATION SYSTEM Oil Pump Sprocket, Oil Pump and Oil Pressure Relief Valve
Oil Pressure Relief Valve Inspection
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Inspect the valve in its assembled stateDisassembly and assembly may change the valve performanceIf any rough spots are found during above inspection, wash the valve clean with high-flash point solvent and blow out any foreign particles that may be in the valve with compressed air