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  1. #1

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    Ribbon delete and spark plug gap adjustments?

    It was just posted on jetboaters site, something I don't think I have heard before - that you are supposed to adjust the spark plug gap to get maximum benefit from ribbon removal.
    I am very curious about this.

    (SX240 is one of the twin engine 1.8l N/A Yamaha jet boats).

    "If you delete your air box like I explained above, maximize your Gap to account for the additional fuel/air. The Gap on my SX240 was set at .040, not the recommended .031 -.035. She ran perfectly. As a matter of fact, with a few other minor things I did to the boat, I could run 55 - 56 mph in perfect conditions."


    The post #31 here:
    https://jetboaters.net/threads/riva-...er.2632/page-2


  2. #2
    Site Admin Green Hulk's Avatar
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    I've never heard of this being a requirement and I've never had to open the gap on any of my ski regardless of any mods, including my turbo skis. They all run perfectly strong.


  3. #3

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    That's kind of what I thought. Thank you!

  4. #4
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    Now indexing the plugs used to be worth around 50 rpm back in the 2 Stoke days.....

  5. #5

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    That's right! So, has anyone tried it on the 1.8l? And would indexing plugs possibly give some positive results?

  6. #6
    Quote Originally Posted by Swatski View Post
    That's right! So, has anyone tried it on the 1.8l? And would indexing plugs possibly give some positive results?
    possibly

    ...that 10-20-30 rpm you may blip here and there may very well be the difference between 1st and 2nd place.

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