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2011 KX450F coolant leaking

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I have coolant coming out of a hole on the right side cylinder head . It is NOT the water pump weep hole. It is located below a hose inlet on the head, Does anyone know what could cause this ?

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I have coolant coming out of a hole on the right side cylinder head . It is NOT the water pump weep hole. It is located below a hose inlet on the head, Does anyone know what could cause this ?

That hole is to allow anything that gets into the spark plug tunnel a place to get out. If I'm not mistaken it is above the head gasket surface and has nothing to do with the head gasket. There are two o-rings that seal the tunnel from the internals of the engine and are only subjected to oil I believe.

If you are seeing coolant I think you need to take a close look at the adapter that is bolted on to the head and the hose that connects to it. Loose clamp maybe?

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I have replaced head gaskets on two bikes that were doing that. Both head gaskets had an obvious track where coolant was crossing into the combustion chamber. I didn't think that weep hole connected to anything but the spark plug either, but apparently it does.

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I have replaced head gaskets on two bikes that were doing that. Both head gaskets had an obvious track where coolant was crossing into the combustion chamber. I didn't think that weep hole connected to anything but the spark plug either, but apparently it does.

Are you telling me that you took a guess at it and it fixed it? Which is ok with me, but I am more of a "why guy". I have not ran into that problem but I have had oil seeping out of that weep hole due to a faulty o-ring. That tunnel I believe is either screwed into the head or pressed in. If the head gasket fixed it, how was the coolant getting in there?

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I'm not sure what seal in the head you're talking about. But there must be a circuit that connects that weep hole with the head gasket. I read a service manual a few years ago that said if coolant is leaking from that hole than your head gasket is blown.

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I'm not sure what seal in the head you're talking about. But there must be a circuit that connects that weep hole with the head gasket. I read a service manual a few years ago that said if coolant is leaking from that hole than your head gasket is blown.

Sounds good enough to me. Next time I have a head off I will look into it.

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I have read all of your suggestions very carefully . Let me say that I have just replaced the piston and rings and all new gaskets , seals that could be changed . I have been working on these things for sometime now and this one has me baffled ? I am in the process of removing the head again to see if there is any obvious indications of leaks. I will let you know what i find by tomorrow night. Thank you guys for all your expert advice.

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I hope it's not a crack or casting flaw into a water jacket. You might do a pressure test and check for leaks to see where it's coming from.

Edited by mx317

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I hope it's not a crack or casting flaw into a water jacket. You might do a pressure test and check for leaks to see where it's coming from.

Thanks , I sure hope it is not cracked !

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Thanks MX317, New head gasket and base gasket and still leaking slightly as of todays ride. But is not that bad so I am just going to live with it for now .Hasn't effected the performance at all , but i believe it is a crack inside somewhere now? Thanks again for all your advice.

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