Question about 2003 Yamaha YZ 450 F

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Dripping coolant and pipe glowing red

Dripping coolant out of overflow and pipe glowing red wat could be wrong there

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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.

Posted on Jul 02, 2009

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Hi maybe the ign timeing or valve timeing is out or the bike is running to weak on the carb

Posted on Jun 21, 2009

  • jason burgess
    jason burgess Jun 21, 2009

    hi maybe the ign timeing or valve timeing is out or the bike is running to weak on the carb



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My 450f was dripping coolant out the overflow and i looked over and my pipe was glowing red but the bike didnt take long to cool down once i stoped it

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