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  1. M

    2004 Yamaha F90 4-stroke - ADVICE NEEDED - attempting rebuild and just located the knock source

    I bought this motor on a 1980's Boston Whaler and the owner explained his son changed the oil but didn't tighten the drain plug fully. Over time it worked its way out and all the oil drained out. He apparently heard a knocking, shut the engine down and quickly figured out what had happened. I...
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