2005 Kawasaki STx-12F Jet Ski Factory Service Manual., Page 189Get this manual
ENGINE TOP END 6-21 C He d
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 stem oil seal andor damaged piston oil rings (This may be indicated hite exhaust moke)incorrect cylinder head gasket hicknessGas leakage around cylinder head Remedy (Action) Remove the carbon deposits and replace damaged parts if necessary
Cylinder compression is lower than Bad condition of valve seating usable range incorrect valve learance incorrect pistoncylinder clearance Piston seizure
Bad ondition of piston ring andor piston ring grooves
Replace the gasket with standard partReplace damaged gasket and check cylinder head warpRepair if necessaryAdjust the alve clearanceReplace the piston andor cylinder Inspect the cylinder and replacerepair the cylinder andor piston as necessaryReplace the piston andor the piston rings