1996-2002 Kawasaki 1100ZXi Jet Ski Factory Service Manual., Page 206Get this manual
16-22 SUPPLEMENT 1997- 1999 MODELS CarburetorFuel Pumo (JH1100-A3A4)
Check these rubber parts for damage-
0-nngs [A] Diaphragm [B] If any of these parts are not in good condition, replace them
Check the vacuum piston diaphragm [A] for damage it is not in good condition, replace it Check that the vacuum piston [B] moves smoothly in the carburetor
If the vacuum piston does not move smoothly, or if it is very loose in
vacuum piston holder, replace the piston andor the holder
bodyThe surface of the piston must not be excessively worn