water in oil from crankcase moisture.
Posted July 16, 2012 - 04:45 PM
Posted July 16, 2012 - 05:46 PM
I have an 05 wr450 and have noticed a lot of milky build up on inside of starter cover and filler plug. oil dosnt look to bad, but does look like it has some water contamination, am going to pull the head and replace head and cylinder gasket, Is there anywhere alse i should also check.
Have you overheated? That would cause the headgasket to blow. At least, that's what caused mine to blow. Is your bike a bit down on power? Your engine would run, but lose a bit of the snap.
That being said, a must more probable cause of the water in the oil is the water pump seal. Change that first. Change the impeller shaft as well. It can get rusted and cause the type of contamination that you describe.
Posted July 18, 2012 - 02:34 PM