1995-1997 Kawasaki 750ZXi-900ZXi Jet Ski Repair Manual., Page 82Get this manual
ENGINlE TOP END 5-9
If cylinder compression is lower than the usable range, check the following' 0Gas leakage around the cylinder headreplace damaged gasket the and check the cylinder head for warp0 Pistoncylinder clearance, piston seizure0 Piston rings, piston ring grooves wear
Cylinder Head Warp Inspection
ULay straightedge [A] across the lower surface o'f the head [B] at several different points, and measure warp by inserting thickness gauge between the straightedge and the head+If w,arp exceeds the service limit, repair the mating surfaceReplace the cyllinder head if the mating surface is badly damagedCylinder Head Warp S'erviceLimit: 0.05 mml