2003-2006 Kawasaki KFX400 service manual, Page 309Get this manual
SERVICING INFORMATION
ELECTRICAL
Complaint No sparking or poor sparking123451234512345Symptom and possible causes Defective ignition coilDefective spark plugDefective generatorDefective CDI unitDefective pickup coilExcessively rich airfuel mixtureExcessively high idling speedIncorrect gasolineDirty air cleaner elementIncorrect spark plug (cold type)Worn piston ringWorn pistonWorn cylinderExcessive valve-stem-to-valve-guide clearanceWorn valve stem oil sealRemedy ReplaceReplaceReplaceReplaceReplaceAdjust carburetorAdjust carburetorChangeClean or replaceChange to standard spark plugReplaceReplaceReplaceReplaceReplace
Spark plug is wet or quickly becomes fouled with carbon