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I flooded my 250ex out this weekend and the oils is really milkey and breather box is filled up, I've heard people say drain the oil, put oil bolt back in, put diesel in it BARELY try to turn it over, drain the diesel, put new oil in and drain it and finally put your final dose of oil through it. I would do that but I'm afraid I'll mess something up with the diesel, please help!
we use ATF trans fluid. we will put a normal amount of ATF, turn it over and let it run for 1-2 min then shut it off and let it sit. let it sit over night. the ATF absorbs the water. so then the next morning you drain it and all water is out and the engine is oils only. you then put in cheap oil, run it for 1-2 min, shut down, drain and finally refill with good quality oil. works every time. we had to do this to several motors when we ran CX in the mini-quads and running4-strokes, they loved to suck water up.
good luck and go slow.