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My friend has a '04 kx250f with a heating problem. The bike has no engine mods and stock pipe. Out of the blue the exhaust head pipe would get hot enough to glow after only idling for 1 minute when its cold! The engine is cold enough to touch but the exhaust is glowing. I shut it down straight away and pulled the carby down and gave it a good clean out. It runs smoother but still glows.

The bike ran great before. I thought that maybe the fuel screw is out?

Jetting is stock and we are at sea level and 20 Degree C.

Any suggestions?

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This is very common when the bike is idling.

You'll be amazed at how it looks when done at night.

No worries there.

Joe

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Thats the answer I'd expect from ADB. Useless

???? Explain please. :banghead:

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It is totally normal! I raced at nite one time and before the second moto i saw the same thing and freaked out. I talked to several other people at the track and they said most all 4 strokes do that. Its enough to scare you though.As long as coolant is not flowing out of the overflow you shouldn't have anything to worry about!

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