On my 400ex my exhaust pipes are blue after they exit the engine through the first bend. Is this normal or do I have a overheating problem?

Thanks

 

thats what my stock headers do.

 

Thats good.
It must be normal then.
thanks

 

Mine have always been like that too.

Someone mentioned that blue-tinted pipes means you're running lean, and therefore hotter than you should be, but I have no idea if this is true or not....so I have assumed it is normal for 400EX's.

 

you better check your plug for a reading!!!!!!
or put a new one in it to get a correct reading.
you might be running to lean!

 

I pulled the plug and it black around the edges (sooty) and light gray to browm in the electrode area and the end piece.
whats this mean?
oh - a Denso x24Ggpr-u stock plug

 

Pipes should be a golden brown color not blue or black if your pipes are turning blue it mean they are gettting to hot this could be from a lean or rich condition. Lean - motor is running to hot
Rich- to much fuel and is burning in the headpipe area . My whole
exhuast is a nice golden brown color. [img]i/expressions/face-icon-small-happy.gif[/img]

 

RX,
You say your pipes are brown, But were they blue during breakin period?
Also Can anyone diagnose my plug (Black sooty around the outsides and Light gray/brown in the middle and end)?
thanks
007

 

What the heck is this GEEK looking thing next to my name?

 

I have 2001 400EX and my head pipes have a blueish tint near the motor as well. The 400 runs extremely lean from the factory. You can bump your main up to a 152 if you are worried about it being to lean. I personally wouldn't worry about it. I think your plug should have a grayish brown color to it if it's jetted right, but I'm not sure about that.