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    Knocking Sound 1990 Johnson 48 SPL

    I don't hear it when it idles or when I'm flushing the motor but when I'm running in the water, fast or slow, there is a knocking from the motor that increases and decreases with rpm's. I noticed a sheen of oil/gas on the water as well. There also has been a thick oily matter coming from behind...
  2. A

    Johnson 48hp SPL (1990)

    I don't hear it when it idles or when I'm flushing the motor but when I'm running in the water, fast or slow, there is a knocking from the motor that increases and decreases with rpm's. I noticed a sheen of oil/gas on the water as well. There also has been a thick oily matter coming from...
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