2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 205Get this manual

2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 205

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6-34 ENGINE TOP END Cylinder, Pistons

Check for uneven groove wear by inspecting the ring seating
The rings should fit perfectly parallel to roove urfacesIf not, replace the piston