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coolant pipe leak

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I have a 2004 YZ450F. I was wondering if anyone knows why coolant is leaking from the coolant pipe that goes into the water pump housing. I pulled the pipe out of the housing and checked the o ring and everything seems fine. It is not leaking coolant out of the weep hole at the bottom of the housing. I installed the o ring under the lip on the pipe. Thanks.

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yeah i had the same problem with my 00 426 so i took out the coolant tube and the oring look ok but i replaced it anyway now doesn't seem to be leaking at all now.. :banghead:

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