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  1. #1

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    Do I really need to check pop-off pressure?

    I'm running an unmodified '95 SL750. I've cleaned out and rebuilt the carbs with Mikuni parts, including the 2.0 needles and seats. I'm using the black springs, the levers are flush with the internal body and the actuation appears to be proper and consistent across all carbs.

    I have a large air compressor but the regulator isn't exact enough as it goes up to 150psi and the 0-25 range is three ticks over 30 degrees, so I can only test general operation. If pressure is set low (5 to 15 maybe, I'm guessing) it doesn't open, but if it's higher (10 to 25, also maybe) it does open. I tested them off the fuel rail with the diaphragm and cover off.

    Can I assume they're close to where they should be and leave it at that? Or is it critical that I buy another one-use-tool for this job?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Somewhere on here is a guide to assembling a simple build-it-yourself pop-off tester. Total cost for the pieces was not that much.

  3. #3

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    I saw that post, but my regulator can't give me exact and consistent pressures in the lower range, and a more precise regulator is more than the price of the actual tool I'm trying to avoid purchasing.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by SeaBee63 View Post
    I saw that post, but my regulator can't give me exact and consistent pressures in the lower range, and a more precise regulator is more than the price of the actual tool I'm trying to avoid purchasing.
    The post I am remembering uses a bicycle pump, air pressure gauge and a few other bits.

  5. #5
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    I have found if you use the Polaris specified parts that the popoff pressure generally falls within the specified range. If you are running black springs and 2.0 needles you should be fine.

  6. #6

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    I used the hand-pump & gauge with a hose. Had a lot of carb problems(hard headed don't like to spend money), got the pop-off pressure right man what a difference it made.

  7. #7
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    Quote Originally Posted by sandonut View Post
    I used the hand-pump & gauge with a hose. Had a lot of carb problems(hard headed don't like to spend money), got the pop-off pressure right man what a difference it made.
    Good for you! If you don't do it and it doesn't run properly it drives you crazy!

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