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  1. #1
    mr. happyfunbear tenjuna's Avatar
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    HELP: Pop-off pressure

    this is a repeat from my engine rebuild thread...reposting here to make sure it gets seen.

    I just checked the carb popoff on my 93 sl650 using a mikuni tool borrowed from jonsonmtz, and the manual says about 18psi for the popoff, but I am getting a reading of ~38-40 psi on all 3 carbs. is it me, is it the tool, or are my carbs el broke-o?



  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Are you wetting the needles with wd-40? What color springs? and what size n/s? They should have a 2.0 and even with the gold 115 gram spring it shouldn't exceed 32psi, unless the springs have been stretched, or the arm has been bent?

  3. #3
    johnsonmtz's Avatar
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    Quote Originally Posted by tenjuna View Post
    .....the manual says about 18psi for the popoff, but I am getting a reading of ~38-40 psi on all 3 carbs. is it me, is it the tool, or are my carbs el broke-o?

    Tool should be good. When setting up my carbs I got around 22PSI on them. Not to sound nasty, but are you sure you're putting the pump on the fuel inlet and not the return line?

    KJ

  4. #4
    mr. happyfunbear tenjuna's Avatar
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    no worries, not taking it nasty at all...I have never done this before so I am assuming it's me doing something wrong.

    based on starflight's post, I can say it's definitely me. I am going to go find a post on how to properly do this...I didn't even know about the wd-40 part so yeah, it's me.

    from what I remember they are the 2.0 and gold springs. since you are asking, that must mean I am supposed to take apart the carbs to do this?

    my manual says to use the inlet and return ports, which is how I was doing this (and yes lol I know which one is which ).

  5. #5
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    The Mikuni manual gives you the info you need.
    Attached Files Attached Files

  6. #6
    mr. happyfunbear tenjuna's Avatar
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    this is why I bought an actual mikuni superbn manual, and I totally forgot it was sitting in the toolbox.

    "3. Remove the regulator diaphragm to observe the needle valve."

    oops. guess it was me after all.


  7. #7
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Opps, Well I guess you missed the discussion with Randy on testing pop-off. witch day was that again? LOL or beer.

  8. #8
    mr. happyfunbear tenjuna's Avatar
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    yeah I missed that part unfortunately...I went back and re-read everything last night and sure enough I overlooked a few steps.

    note to self: do not drink beer while rebuilding enginge...do it before.

  9. #9
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Quote Originally Posted by tenjuna View Post
    yeah I missed that part unfortunately...I went back and re-read everything last night and sure enough I overlooked a few steps.

    note to self: do not drink beer while rebuilding enginge...do it before.
    Wrong before,during and after,makes it more interesting that way.

  10. #10
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Quote Originally Posted by Keddano View Post
    Wrong before,during and after,makes it more interesting that way.
    That's the way I do it.
    Hmm.... Perhaps that's why I've had some interesting issues. Reed gaskets, fuel plumbing, and I'm sure there are more.

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