2003 Kawasaki 1100 STX D.I. Jet Ski Factory Service Manual, Page 42Get this manual
PERIODIC MAINTENANCE 2-13 Maintenance Procedure
Steering Shaft [B]
Spark Plug Inspection
Remove the spark plugs (see Spark Plug Removal)[B][C] and electrodes [A] Examine the ceramic insulatoror very white, or if there are gray metalIf the insulator appears glazed
lic deposits on the electrodes, combustion chamber temperatures are too highRefer to TroubleshootingIf the insulator appears dry and sooty the fuelair mixture is overly richIf 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, replace the plugIf the electrodes are badly worn or burned, replace the plugExamine the spark plug threadsIf the threads are damaged, replace the plug
Spark Plug Adjustment