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Need help with coolant

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I have a 2004 crf 450r and about every other time I start it the front of the header pipe glows red in about 10 seconds so I shut it off and open the radiator cap which has alot of pressure behind it so I have to open it slowly to let it cool then I try it again and it works fine sometimes. Has anyone else had this problem if so what is causing it?

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blown head gasket could be the case, its pushing air into the water jacket, also the radiator cap might need replacing.

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