Reply To: 1974 Evinruded 9.9 HP question

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July 13, 2021 at 10:23 am #242721
David Stanton
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    NGK spark plug is number B7HS for your 1974 9.9 HP, or the resistor version is BR7HS. Both will work fine. The resistor version just eliminates some interference in onboard radios if that is a problem.

    Note that the “7” in the number is NGK’s designation for heat range and, opposite of Champion, the higher the number, the lower the heat range.

    The B7HS replaces Champion UL-81C that was specified for your motor.

    Dave