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  1. 03-10-2022, 12:43 PM #1
    tav
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    92 johnson plugs

    been buying champion plugs for some time QL78YC with no problems. but what the difference
    between these plugs and QL77JC4 , these are from marineengine.com but none of the 78yc.
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  2. Rickyp01
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    #2 03-11-2022, 10:19 AM
    Might want to do a search it has been discussed in this forum
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  3. SEAHORSE
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    #3 03-13-2022, 06:59 AM
    The QL78YC plugs have a longer nose that protrudes into the combustion chamber while the QL77 is shorter. In the wrong engine, the QL78YC with its longer nose could hit the tops of the pistons.
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