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  1. #1
    PWCToday Newbie
    Join Date
    Jun 2016
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    Cocoa, FL
    Age
    42
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    17

    Mikuni rebuild question

    I installed the little round check valves in the pump body. How flat should the check vlaves be to the pump body ? seems like i can push them down a bit like they are hold a bit up from being flat .... is that an issue ?

  2. #2
    Resident Guru JC-SuperJet's Avatar
    Join Date
    Jul 2013
    Location
    Cypress, TX
    Posts
    834

    Re: Mikuni rebuild question

    Big issue. Needs to seat Flat. It appears you installed them backwards.

    The Check Discs are cut from a sheet of plastic that comes in a roll, thus have a residual curve in them.

    The Manufacturer puts a blue line on them to identify the flat side, but you can just eyeball the curve.

    If the disc does not lay flat, it cannot seal the hole...

  3. #3
    PWCToday Newbie
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    Jun 2016
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    Cocoa, FL
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    17

    Re: Mikuni rebuild question

    They were NOT installed upside down when I rebuilt the carbs about 6 months ago ...... I know that for a fact. I just dont know why they are now not laying flat. I used a genuine Mikuni kit when I did the rebuild.

  4. #4
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Mar 2003
    Location
    wisconsin
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    51
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    10,025

    Re: Mikuni rebuild question

    Are you running ethanol fuel?
    RCJS also doing business as WATCON
    608-743-1305 9am to 5pm CST m-f
    email watcon@watcon.com

    Please visit our web sites

    new parts / products / services www.watcon.com
    used parts www.rockcountyjetski.webs.com
    thank you

    Please check out and like WATCON on Facebook

  5. #5
    PWCToday Newbie
    Join Date
    Jun 2016
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    Cocoa, FL
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    Re: Mikuni rebuild question

    I did. Had a problem with water In the fuel and it trashed the NS and springs . I have family near SBT and might have them pick up new check valves.

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