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90hp yamaha spark plug gapping

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  • 90hp yamaha spark plug gapping

    year 1999 90hp yamaha

    does anyone know the proper gap #
    thanks
    jason

  • #2
    Re: 90hp yamaha spark plug gapping

    .035 - .039" That's the gap for my 1999 75 and they're basically the same motor.2 stroke that is.

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    • #3
      Re: 90hp yamaha spark plug gapping

      thanks,
      the guy at the store said they come gapped
      mutch to my surprise they were in the middle at .037- .038

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      • #4
        Re: 90hp yamaha spark plug gapping

        Just as important as the gap is the proper torque. Which spark plug did you install?

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        • #5
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          Re: 90hp yamaha spark plug gapping

          Originally posted by BruceAML View Post
          Just as important as the gap is the proper torque. Which spark plug did you install?
          yup.Don't over torque 'em.

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