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  1. #1
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    correct spark plugs for 1998 Mariner 225HP EFI Magnum

    What are the proper plugs for a 1998 Mariner 225HP EFI Magnum 3.0L outboard? NGK brand but what specific type? I'm not the original owner and don't have a manual for it.

    Thanks.

  2. #2
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    Mercury calls for a champion QL77CC.

  3. #3
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    Do not use anything else, or you could have the weirdest symptoms.

  4. #4
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    Are you sure it's a 3.0L 225? ....I thought a Magnum was a 2.5L like a ProMax?

  5. #5
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    I checked and it is indeed a 3.0L. Coiling/stickers are original and says 3.0L on back under 225HP.

  6. #6
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    Stick with the Champions Plugs Stay away from the NGK's Not the same Quality JMO!!

  7. #7
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    Quote Originally Posted by Go Time View Post
    Mercury calls for a champion QL77CC.
    X2 and as said before stick with the champs

  8. #8
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    Quote Originally Posted by Go Time View Post
    ....I thought a Magnum was a 2.5L like a ProMax?
    PM's Badged as "Super Mag"........Magnum EFI is "plain jane" 2.5 or 3.0

  9. #9
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    Got it..that's right

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