Reply To: Spark plug for Martin 200

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November 11, 2018 at 2:00 pm #143781
LIETHA RONALD
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    Rich: Depending on what you are using the motor to do. I run NOTHING but NGK B-6S, B7S, B8s. just different heat ranges for slow or fast running but rule of thumb, use B7S
    Ronald
    Tomahawk