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  1. #1

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    pop-off pressure checking question

    I just finished cleaning and rebuilding my carbs, as I was testing the pop-off pressure I notice air blowing out the oil inlet ports. Is this normal???
    Thanks


  2. #2
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    I did not see any such behavior on my two rebuilds.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    I think the oil inlet fittings have internal one way check valves. Yours may need cleaning/flushing out to unstick them.

    Edit: Aparrently not. Carbs are really not my thing

  4. #4
    johnsonmtz's Avatar
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    If they are Mikuni SBN's there is no check valve on the inlet. The only way to properly test these is to block off all but one fitting on the fuel side of the carb and use that one to operate the pump.

    KJ

  5. #5
    Sooo...how much for the 780? stimpsonjcat's Avatar
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    Yes, you must seal the other FUEL INLETS, but I did not seal the OIL INLET during my pop-off testing and it went fine.

    I think there is some form of check valve in the oil portion of the carb, pretty sure I saw a procedure for testing it posted here.

  6. #6

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    Yes there Mikuni SBN's from a 97 785 pro, looking through the manual I cant see any check valves so I'm assuming air blowing through is nornal and i'll block it off for a retest. Thanks s bunch


    Quote Originally Posted by johnsonmtz View Post
    If they are Mikuni SBN's there is no check valve on the inlet. The only way to properly test these is to block off all but one fitting on the fuel side of the carb and use that one to operate the pump.

    KJ

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