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Popping way bad on deceleration

Discussion in 'Technical' started by JayJay, Jul 11, 2017.

  1. JayJay

    JayJay New Member

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    im up against the ropes on this one. 07 k9, 117 motor, Vance and Hines big radious pipes. Word is mixture needle should be out 11/4 to 1/12 ball park. I noticed mine is out almost 3 turns. I do notice raw fuel in the exhaust when I first get it out of the garage, but it runs very nice. Problem is when I bring the needle in closer to text book settings, bike pops and cracks terrible on deceleration. Carb is jetted correctly with a 32 mid jet, and I've done the intake leak test useing carb cleaner. Doesn't seem to have any. Any help would be great. Also are these pipes known to be bad for that. I'm assuming I'm running it really rich just to stop the decel pop !
     
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  2. Th3InfamousI

    Supporting Member

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    Not running baffles? How's the plugs?

    I don't know my bikes all pop on decel, but I don't run baffles so I just don't loose sleep over it.

    Sent from my 2PS64 using Tapatalk
     
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  3. bigkelk9

    bigkelk9 Well-Known Member
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    My bike pops on decel and on shifting gears.. pretty common if u don't run baffles. A buddies bike who's is the same as mine with baffles doesn't pop.. So go from there..
     
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  4. bigkelk9

    bigkelk9 Well-Known Member
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    By the way, one is an 06 and the other is an 07 k9, both have big radius pipes, one with baffles don't pop, the one without pops..
     
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  5. awg

    awg Well-Known Member

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    And there you go!
     
  6. JayJay

    JayJay New Member

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    Good info, I guess I'm making more of it than it is, I guess run her a little fat or let her pop !
    Not running baffles definetly seems to play a big part. Thanks guys.
     
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  7. Kobi

    Kobi Member

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    Three turns out on the mixture and raw fuel in the exhaust would indicate you have issues. Are you three turns out to have a nice idle, or to reduce the popping? How do you see the raw fuel in the exhaust and where?
     
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  8. BWG56

    BWG56 Guru

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    Read this maybe it will help
     

    Attached Files:

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  9. pauly

    pauly Active Member
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    And while you at it, put new mixture screw in. They do wear out.
    Also check your exhaust gaskets for leaks.

    Paul.
     
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  10. JayJay

    JayJay New Member

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    3 turns out to stop the popping, it will run fine tunning per s&s instruction, just pops on decel like crazy there. Bike has been like this since the 640 lift cam install. When I say raw fuel I mean you can smell it in the exhaust only when it is cold. Once warmed up you don't notice it. Also exhaust gaskets and such seem to be just fine.
     
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  11. cdogg556

    cdogg556 Guru

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    I run a 78 main and a 32 idle, air mixture screw out 2 3/4 turns, baffles cut in half, no popping at all and still loud as hell and faster with the half baffles in then without.
     
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  12. Fat_Bastard

    Fat_Bastard Active Member

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    Sometimes popping on decel is a sign it is running a little lean on the bottom end...

    Richen it up to see if it goes away,
    Best way is to temporarily test for a few seconds on DECEL ONLY by:
    Ride it around after warmed up (5 minutes) put it into a closed throttle decel from say 2nd or 3rd gear for a good distance from mid level to high RPM and as soon as you let off the throttle pull up a little on the choke lever to create a richer condition, bring it down to about a thousand RPM; if this stops the popping then you know what to do -- go richer on the bottom end... (air screw, pilot jet, etc.).

    PS: Check your air cleaner for holes, gaps incorrect seal too.
     
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  13. JayJay

    JayJay New Member

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    Yours seems to be on about the same settings as mine, which mine doesn't pop and go on at 23/4 eather, so maybe running on the rich side is ok, just enjoy and stop fretting about the needles setting not being text book.
     
  14. Gmutoagrsv

    Gmutoagrsv Active Member

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    What’s your elevation? I’m at about 5500 and had similar issues. Or did you get it straightened out?


    Sent from my iPhone using Tapatalk
     
  15. JayJay

    JayJay New Member

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    Elevation 978, still have the problem, replaced the needle, rebuilt the carb. Still have to run rich.
     
  16. Gmutoagrsv

    Gmutoagrsv Active Member

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    Gotcha. I went and got new pipes in hope that’ll help too.
     
  17. JayJay

    JayJay New Member

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    I was thinking the same, let me know the results of the pipe change.
     
  18. TapioK

    TapioK Well-Known Member
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    Did you play with air mixture screw? I can make popping or not just by turning it a bit richer or leaner...
     
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  19. francoblay1

    francoblay1 The Spaniard

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  20. JayJay

    JayJay New Member

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