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    1984 Johnson GT 2.6 spark plug question

    Anybody know what the difference is between the Champion QL16V and Champion UL77V? I know the regular 235hp calls for QL16V but my manual / parts book calls for the UL77V in my GT2.6. I have been running the QL16V but they foul quickly and am wondering if they aren't hot enough. We use boat...
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