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  1. #1
    Buck3yeRideR's Avatar
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    Pop-off pressure testing write up?

    I'm looking for a pop-off pressure write-up or how to. The one on the Polaris knowledge site it not working.

    I've read the procedure in the OEM manual but some things don't add up to me.

    Am i correct to say that you plug the fuel outlets, and pressurize the carb through the fuel inlet? And at a certain point the needle should "pop-off" and release the pressure?


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Post #7

    http://www.greenhulk.net/forums/showthread.php?t=15433

    Basically you are correct.


    Or you insert the pop off pump into the fuel inlet where the filter/screen is and test them like that.

  3. #3
    Buck3yeRideR's Avatar
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    ah ha thanks Kevin, I never realized that is the Mikuni manual.

    Is pop-off pressuring testing necessary if you've rebuilt the carbs with Watcon's kit?

    If I put the pump into the direct fuel inlet, will that bypass plugging the fuel line outlet / attaching pump to fuel line inlet process?

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Pop off test is mandatory. You want them all the be exacrly the same or really, really, close. You don't want 1 cyl poppping sooner or later than the others. That may make a tuning nightmare...

    If you place the pump directly into the inlet, you don't need to worry about anything else. Just make sure the needle and seat are wet for each test. And make sure to wear safety glasses. Because it will spray whatever you are using to wet the needle right at you if you're not careful.

  5. #5
    Buck3yeRideR's Avatar
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    I went to harbor freight today to buy a Mityvac, but realized it was only vacuum. Mityvac has one that does pressure/vacuum but of course HF didn't have it.

    Is this the correct tool to buy or something else? To perform pop-off, leak down test.
    http://www.mityvac.com/pages/products_hvpk.asp#MV8500
    MV8500

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I cannot say for sure that will work for the pop off tester, but will work for the leak down tests for sure. Although, if it reads pressure, it should be OK.

  7. #7
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    I have used a similar one for testing popoff in the past.

  8. #8
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    John Z has them for about $50 shipped , SBT has a nice one as well for about the same price. I bought the one from John Z and it works very nice, the gauge only goes up to 50psi but the pump itself can go up to 100psi

  9. #9
    Buck3yeRideR's Avatar
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    Quote Originally Posted by ujustlost View Post
    John Z has them for about $50 shipped , SBT has a nice one as well for about the same price. I bought the one from John Z and it works very nice, the gauge only goes up to 50psi but the pump itself can go up to 100psi
    http://watcon.com/Catalog_Pages/High...olume_Pump.htm

    I'm guessing your referring to the above. But it doesn't look like it can produce a vacuum, only pressure.

    I'm trying to think of an easier way to do these tests and not spend $50 on them.

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by Buck3yeRideR View Post
    http://watcon.com/Catalog_Pages/High...olume_Pump.htm

    I'm trying to think of an easier way to do these tests and not spend $50 on them.
    Stop by again..... (free)

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