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  1. Z

    greenish foam from cylinder # 4 (lower) on my 100hp Merc 1992

    I went to tune up my motor listed above. when I removed the lower plug I found it had a type of laquor looking coating on it. I could not see the top of the piston well so I turned it over to top the piston. When I did that a large quanity of greenish looking water oil combo came out. The other...
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