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  1. #1

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    Another carb question

    Hi, I have post questions about the mikuni carb before, but this is a different set of carb, I am rebuilding two SUV. ok here is the question, This SUV i was rebuilding have two burn pistons. And after taking everything apart I found the proplem (i think). The carb fail to hold the pressure 10 psi for 30 sec. I can actually heard the air from the pump side where the build in filter layer is. So I open it and found out that the pervious owner use the wrong gasket while rebuilding last time (pic1). So i bought the rebuild kit and put in the right gasket(pic2). How come it still leak from the same place? Well it leak much much less, it will hold the 10psi for 15sec and you can only see the little leak by spaying WD40 in it. The gasket is new and is there any sealant i can put on the gasket? and yes all new gasket including the rubber ones. Thanks
    Click image for larger version. 

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    Pic 1



    Click image for larger version. 

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    Pic 2


  2. #2
    Yamaha artisan Cutlass's Avatar
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    I'm not following your carb pressure test. what are you pressure testing?

  3. #3

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    I am testing the n/s and make sure it hold 10 psi for 30s without leaking. But the problem is that the leak is at the filter layer of the carb... The layer where I showed in the picture. It leak from the side.

  4. #4
    Yamaha artisan Cutlass's Avatar
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    Are you using the oring style seal under the paper gasket? Is there any old gasket material that needs to be scraped off/causing the new gaskets not seal?

  5. #5
    mudslanger's Avatar
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    If you have the original O rings from the carbs use them. there is a difference for some reason the original Yamaha O rings are thicker. if you use the replacements in the kits they will leak but not all the carbs had the thicker O rings. this may not be your problem but one i have run into in the past.

  6. #6

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    there is no paper gasket. Will I have it in the kit but it is not being use. according to the manuals from mikuni it is the gasket that feel like rubber.
    And i point out where it is leaking.
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  7. #7
    mudslanger's Avatar
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    You need to replace the large O ring and the bottom O ring with the different chambers. (couldnt remember the correct name for the segmented O ring) you will have to order then from Yamaha unless someone on here has some.

  8. #8

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    I got rebuild kit with all the rings

  9. #9
    Yamaha artisan Cutlass's Avatar
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    genuine Mikuni kit or aftermarket?

  10. #10

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    Wsm kit

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