i hope that i am not the first failure with the 450 cam swap but i know that coolant out the breather hose is a very bad thing. is there anything other than a blown headgasket that would allow the mingleing of these 2 incompatable fluids? bike was running great other than an oil leak out of the decompression plug. maybe the oil got too low and the gasket fried. how big of a job is it to change out the head gasket?