yzf 400 head pipe glowing red


10 replies to this topic
  • mxjamaica

Posted December 11, 2009 - 08:38 AM

#1

yzf 400 over heating immediately as fired up. timming is ok, valve clearnces ok, carb is clean, help please. could it be blown head gasket?

  • byggd

Posted December 11, 2009 - 10:55 AM

#2

Do a search using "glow" or "glowing" as the search word. You will find hours a reading!

  • robwbright

Posted December 11, 2009 - 11:04 AM

#3

My YZ250f was doing it and I checked valves, timing, cleaned the carb with carb cleaner, blew thru each of the jets, etc. . . It was only red hot while idling and/or very low throttle. Was not lean while riding 1/2 throttle to WOT.

Ended up taking the carb apart again. There was a tiny piece of dirt stuck in the pilot jet. Got it out and problem was resolved.

YMMV

  • l_campionero

Posted December 11, 2009 - 05:34 PM

#4

Perhaps 'Glowing Red Pipe' should be 'stickied'....

  • byggd

Posted December 12, 2009 - 06:00 AM

#5

It is 4th on the FAQ
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  • mxjamaica

Posted December 13, 2009 - 11:23 AM

#6

now i have oil pouring out the small hole on the right side of the head.

  • l_campionero

Posted December 13, 2009 - 11:30 AM

#7

now i have oil pouring out the small hole on the right side of the head.


There is no oil behind that hole. It is a 'weep hole' to allow water out of the spark plug well.

  • Strattos

Posted December 13, 2009 - 01:35 PM

#8

If you've got enough fluid in that cavity for it to be "pouring out" you may need to look at plugging the weep hole when you're washing your bike, or being a bit more careful with your hose/pressure washer.

  • mxjamaica

Posted December 13, 2009 - 03:04 PM

#9

i know that there should'nt be any oil its because its a hole to the spark plug... so do you think the head has a crack? after a minute or so u can see a lot of oil coming out

  • William1

Posted December 14, 2009 - 08:03 AM

#10

It may also be the valve cover gasket is bad and weeping down the spark plug cavity.

  • l_campionero

Posted December 14, 2009 - 08:12 AM

#11

It may also be the valve cover gasket is bad and weeping down the spark plug cavity.


That's an idea, and easily fixed if so.:moon:




 
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