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  1. #1

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    Epoxied GP1200R intake manifold crossover passages

    Iíve read about people doing this to the intake manifold crossover passages. But I canít locate any threads on what the benefits are. Every time I search all that comes up is epoxy for tunnel or exhaust manifold threads.
    Any help is greatly appreciated.

  2. #2
    Adam's Avatar
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    The cross over passages are under the Carb mounts , they allow the interchange of vacuum between intake manifolds . When they are blocked off it increases the vacuum in each carb throat ( signal strength) that sucks fuel from each carb . A sharper suction pulse draws fuel better at high rpms and does a better job of providing fuel at all rpms . More precise jetting and more power !

  3. #3

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    Thanks Adam.... I figured it had something to do with carb signal.
    Any photos or tutorials on how to do this mod?

  4. #4
    Adam's Avatar
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    Quote Originally Posted by Jonesyfxr View Post
    Thanks Adam.... I figured it had something to do with carb signal.
    Any photos or tutorials on how to do this mod?
    Just fill the grooves with Sika flex and go .

  5. #5

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    I was thinking about using West Systems Six10 two part epoxy applied with a mixing tip.

  6. #6
    Is there any negatives for filling the cross over passages? I have a stock ski except carbs jetted to OSB recipes and flame arrestors. Do you lose any low end power from filling the passages?

  7. #7

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    From what I understand, you get a better carb signal per cylinder.


  8. #8
    Please take photos and post if you do this mod!

  9. #9

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    Quote Originally Posted by Adam View Post
    The cross over passages are under the Carb mounts , they allow the interchange of vacuum between intake manifolds . When they are blocked off it increases the vacuum in each carb throat ( signal strength) that sucks fuel from each carb . A sharper suction pulse draws fuel better at high rpms and does a better job of providing fuel at all rpms . More precise jetting and more power !
    Would I have to re-jet to make this mod work??

  10. #10

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    Quote Originally Posted by SDGP1200R View Post
    Please take photos and post if you do this mod!
    I surely will, I have to research if we would need to re-jet after doing this mod.

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