2004-2005 Kawasaki STX-15F Jet Ski Factory Service Manual., Page 192Get this manual
ENGINE TOP END 6-21 Cylinder ead
The following table should be consulted if the obtainable compression reading is not within the usa ra Problem Cylinder compression is higher than usable range Diagnosis Carbon accumulation on piston and in combustion chamber possibly due to damaged valve tem oil seal andor rithis indicated by white exhaust smoke)incorrect cylinder head gasket thicknessGas leakage around cylinder head Bad condition of valve seating incorrect valve clearance incorrect pistoncylinder clearance Piston seizure Remedy (Action) Remove the carbon deposits and replace damaged parts if necessary
Cylinder compression is lower than usable range
Bad condition of piston ring andor piston ring grooves