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I've discoverd milky engine oil in this 9.9 yami four cycle engine. I've pulled the head and all looks good as far as no rust or cracks. Does anyone have the torque spec's and head bolt tightening sequence? Also would like to know the valve clearances. What would be a good way of flushing the contaminated oil out of this engine? Anything else you may want to add would be greatly appreciated. Thanks in advance for your help.