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  1. #1

    Default 1971 Mercury Outboard 7.5 HP Spark Plug Question

    Thunderbolt Ignition Serial# 3020217Can anyone direct me where I can find the following?What is the point gap?What is the spark-plug gap?Type of spark-plug recommended?Any information would be appreciated.Thank you

  2. #2
    Admiral Barnacle_Bill's Avatar
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    Default Re: 1971 Mercury Outboard 7.5 HP Spark Plug Question

    Point gap should be .020Plugs are NGK BUHW-2 (perma gap)If you use the motor mostly for trolling, go with something like Champion L-77J and gap them at .050.
    "A manual is a cheap investment"
    Fair Winds and Following Seas
    Bill
    PTC USN ret

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