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  1. #1
    Join Date
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    Engine noise normal or not

    96' Merc 150 EFI. Engine sitting for a while. Replaced impeller and started with cowl off using water barrel. Tapping noise like you would hear on a car engine needing a valve adjustment. Used engine stetho-scope on all cylinders and they all sound the same. Is this normal for this 2 stroke? Have owned 2 other outboards but never noticed this tapping. Thanks

  2. #2
    Join Date
    Feb 2004
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    georgian bay , ontario , canada
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    T basser what you are hearing is probably the injectors firing.You are not likely to hear this with the cowl on and don't often run the engine without it. Hopefully that is all you are hearing.Good luck and happy new year Bmax!

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Chris Carson's Marine