Maintenance & Technical > KX500 Original

spark plug color

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stock500:
what does this grey color mean?

Hillclimb#42:
Indicates its been hotter than you want it. Either lean , preignition or wrong plug heat range or something causing it to burn hot. Tan/brown is right. Dry and dark brown is what I like.

kaw rider:
piston melting, pull the head on look.

stock500:
As far as running hot, I have a question.  I noticed when I stopped that my engine felt pretty hot, but my radiators were cold???  How do I check that my impeller is getting the flow it should. 

KXcam22:
Stock,
  I you pull the rad cap with the engine cold and fire it up the flow should be evident.  Cold rads, warm engine is a strong inidcator that you are not any getting flow.  I recall one member who had the impeller spinning on the shaft.  Rare but can happen I guess.  The nylon pump drive gear could be a weak point, but then again after 14 years mine looked like new. I would suggest taking the water pump apart and inspecting. Also, definitely pop off the head and look at the piston crown.  Its hard to tell from the pic but there appears to be some deposits on the plug, possibly aluminum. Cam.

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