Question about 2003 Yamaha YZ 250 F

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My bike misses when started and the header pipe glows red hot !

I have rebuilt the carburator ,because I thought that was the problem! It still does the same thing ,could it br the water pump?

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Posted on May 16, 2010

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I just rebuilt my motor on my yz250f and the pipe is still glowing red what should i do?


Thats a sign of being rich, keep in mind that all of my four strokes will glow red at the header pipe while the choke is on.

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What coud be making my pipe got red hot


Hi, the pipe getting red at the header is caused by the fuel mixture being to lean or the ignition timing being too retarded. Check the induction side of the engine for air leaks and the carburettor for blockages etc. Check the ignition timing.
Hope that helps Matt...

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the pilot jet is too only make the bike idle so it wouldnt be this is the engine have lots of oil in the engine

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The header pipe will glow red when you run it on choke, during warm up. This is normal while sitting. You shouldn't see that one you start riding it though.
The coolant drip could be just a dirty or failing radiator cap. My bike will push a little out if I completely top it off full. Hope this helps.

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