400 ex Blue Exhaust Pipes
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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]
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]
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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.