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I need help, I have been through 3 head gaskets on my 04 250. The head is straight and clean as is the mating surface on the cylinder. It will not seal. As soon a I fire the bike it starts leaking coolant into the cylinder and not just a little as soon as I shut the bike down and pull the plug there is coolant on it. It will only run for a few seconds. Any help would be great I have done many 2 stroke top end and have never had a problem like this. This double o-ring setup sucks. Thanks,