Question about 2002 Yamaha YZ 426 F

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Coolant fluid leaking when warming up

When my yz426f is warming up coolant comes out of somewhere & steams up off the header. Once its warmed up it seems to stop. Is this bad?

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  • danny
    danny May 11, 2009

    Its leaking only when its warming up not cooling down, but I can understand the theory in your solution

  • danny
    danny May 11, 2009

    Haha, Have you ever seen a 426 start cold & idle right away without reving it?! I think its coming from the overflow it stops when the bike is at running temp

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Tighten all hose clamps ,  this is caused by the hoses expanding and contracting with the water temperature , when it is cold the hoses have cooled down and leaking will happen, 

Posted on May 10, 2009

  • Paul G
    Paul G May 11, 2009

    yes but when it is warming up the hoses are cold and the the head is only just starting to expand with the heats as well,  
    Try this .
    from a stone cold position start the bike don't rev it just watch it idle , look at the hoses watch where the water is coming from it can also be a gasket (same principle )very important that you see where it is coming from if the hoses are all good then the water pump gasket is not sealing properly .

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For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
http://motocrosshideout.com/2011/08/19/why-is-coolant-coming-out-the-overflow-tube
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It has to go somewhere!

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