1996-2002 Kawasaki 1100ZXi Jet Ski Factory Service Manual., Page 60Get this manual
3-8 EMGINE LUBRICATION SYSTEM Oil Tank
07 Tank Removal
Drai the engine oilLoose the cla'mp and pull the oil level sensor [A] out of the oil tankTak out the straps
Oil Tank Cleaning
Flus the tank repeatedly with high flash-point solvent until it is clean