2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 206Get this manual
ENGINE TOP END 6-35 Cylinder, Pistons
Piston Ring Th ickness
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If any of the measurements is less than the service limit on either of the rings, replace all the rings
When using new rings in used piston, check for uneven groove wearThe rings should fit perfectly parallel to the groove sidesIf not, replace the piston