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Thread: Pop off to high

  1. #1

    Pop off to high

    My pop off is to high, so I'm not getting any fuel to the motor. I rebuild the carbs, replaced the fuel lines, cleaned everything. My rebuild kits only came with one spring. I need to find or order some 95g springs. Anybody know where to order some.


  2. #2

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    KrunchovXPL-GTX-RX's Avatar
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    Does a 38mm Mikuni kit come with gold springs?

    There is only one higher than the 95 (the gold 115g spring).

    If your current springs are not gold you will be going up with a 95g.

    Besides, I am not sure that too high a popoff would keep it from running. It might run poorly at idle and fall on its face, but I think (though I could be wrong) that it would still run.

  4. #4
    If the pop-off is too high, there isn't enough fuel pressure to overcome the vaccuum and spring pressure, and you will have hard starts, as the engine is not spinngin fast enought o produce enough pulse, to make the pump supply enough pressure to flow the fuel into the regulator chamber

  5. #5
    96XPSS's Avatar
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    Quote Originally Posted by Inked View Post
    If the pop-off is too high, there isn't enough fuel pressure to overcome the vaccuum and spring pressure, and you will have hard starts, as the engine is not spinngin fast enought o produce enough pulse, to make the pump supply enough pressure to flow the fuel into the regulator chamber
    This theory is completely wrong. Pop-off is when the fuel pressure ovecomes the spring pressure, and allows fuel to also go through the high speed jet, to add additional fuel to the already open pilot jet.

    You have other issues starvng the ski for fuel. I suggest removing the selector switch and inspect for crud inside it first.

  6. #6
    Greatest Grandpa jhjesse's Avatar
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    Do you still have the original springs from the n/s assembly. If so use them instead of the new springs.

    Also do what 96XPSS says on the selector valve.

    Could also check the O ring on the filter housing. That could very easily be not sealing properly and letting air into the system.

  7. #7
    96XPSS's Avatar
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    Did you get a chance to pull the selector switch yet?

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