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Thread: Sparkplug Gap

  1. #1
    Senior Member Cid6.7's Avatar
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    Default Sparkplug Gap

    I've been searching the forum I just got new NGK plugs & saw the gap should be from .20 to .24 for my 97 Challenger 1800 Twin..
    I know .04 isnt very much but what is the manufacture specs? Or "preferred" gap

    Thank You

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  3. #2
    kustomkarl's Avatar
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    Default

    Spark Plugs 2 stroke ALL of them NGK BR8ES Gap/ 0.5-0.6mm or .020-.024in.

    Karl
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  4. #3
    Senior Member Cid6.7's Avatar
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    Thanks again karl
    Ok did a compression test on both engines 150 straight across both engines woot..! New plugs all around gapped to .022 ( split the difference ) lol

    But now my idle is way high @ 3000rpm as soon as they fire up..
    Shall I just turn idle screw down so idle around 1000rpm? Should this be done in water or on trailer..

    Thanks again

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  5. #4
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    3,000 on trailer is 1,500 in water, and thats good
    Ride it like you stole it !

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  6. #5
    Senior Member Cid6.7's Avatar
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    Quote Originally Posted by glenwhitt View Post
    3,000 on trailer is 1,500 in water, and thats good
    Wow then my idle was way borked with them fouled up plugs..lol

    Were both @ 1200rpm on trailer..lol

    Thanks glen

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  7. #6
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    ya. 1200 on trailer is like stall out in the water

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