2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 142Get this manual
4-4 ENGINE LUBRICATION SYSTEM Engine Oil Flow Chart
A: Blowby Gas B: Supply Engine Oil Flow C: Return Engine Oil low D: Oil Sump 1from Oil Pump Side Passage 2Oil Cooler 3to Main Oil Passage 4Oil Passage Bolt 5Oil Pressure Switch