2000-2001 Kawasaki 1100 STX D.I. Jet Ski Factory Service Manual., Page 239Get this manual
ELECTRICAL SYSTEM 13-27 Ignition System
Spark Rug hspecfion Remove the spark plugs (see Spark Plug Removal)'e Examine the ceramic insulator [C] and electrodes [A] IB]
If the insulator appears glazed or very white,
OK if there are gray metallic deposits on the electrodes, cmbustion chamber temperatures are too h4gh, Refer to TroubleshootingIf the insulator appears dry and sooty the fueVair mixture is overly riche If the insulator and electrodes are wet and oily, an improper oil type or an excess oil output may be the causeIf the ceramic insulator is cracked, replac'e the plugIf the electrodes are badHy worn or burned, replace the plugExamine the spark plug threadsIf the threads a're damaged, replace the phg