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  1. May 28th, 2009, 11:42 PM #1
    ElmoKid
    [OP] ElmoKid is offline
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    Default What is plug gap for old (pre-1979?) 9.9 HP Mercury

    I have an old (I believe it is pre-1979) Mercury outboard that is a 9.9 HP using NGK B7S spark plugs. The color of the motor is white.
    What is the correct spark plug gap for this motor and plug?
    How do I determine the date of manufacture?
    Thanks.
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  2. May 29th, 2009, 06:38 AM #2
    Dunaruna
    Dunaruna is offline
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    Default Re: What is plug gap for old (pre-1979?) 9.9 HP Mercury

    Does it look like this -

    http://www.oldmercs.com/196263merc110.html

    Can you find a serial number on the id plate?
    Watch this space......................
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