2003-2006 Kawasaki KFX400 service manual, Page 306Get this manual
SERVICING INFORMATION
Complaint Engine overheats
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Symptom and possible causes Carbon buildup on piston crownInsufficient amount of engine oilDefective oil pumpClogged oil circuitFloat chamber fuel level too lowAir leakage from intake pipeIncorrect engine oilDefective cooling system
Remedy CleanCheck level and addReplaceCleanAdjust float heightTighten or replaceChangeSee radiator section
RADIATOR