Welcome to Our Community

Wanting to join the rest of our members? Feel free to sign up today.

Sign Up

Deceleration popping

Discussion in 'Exhaust' started by Spikes05, Mar 25, 2017.

  1. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    Hey y'all I want to get straight on what causes deceleration popping. Some say it is a rich air fuel situation and others say that it is a lean air fuel situation. So which is it to rich or to lean?


    Sent from my iPhone using Tapatalk
     
  2. bdm7250

    bdm7250 Guru
    Supporting Member

    Joined:
    Jun 3, 2016
    Messages:
    6,418
    Likes Received:
    16,332
    Trophy Points:
    113
    Location:
    Hamilton Ontario Canada
    My Bike(s):
    2008 BD Mastiff 2008 AIH Slammer
    First Name:
    Doug
    Popping on deceleration is caused by a LEAN condition. When you suddenly close the throttle, the incoming air is choked off and the closed throttle also causes the bike to return to idle on the very lean idle circuit. However, momentum of the bike is actually "driving" the engine in a sense, and that engine is still spinning at rpm that needs far more gas than the closed throttle position can provide. The engine is still spinning but the incoming fuel rate is very low, until just enough builds up in the combustion chamber to "fire" on the exhaust stroke of the engine.
     
  3. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    So would you increase the intermediate jet or the main jet or both


    Sent from my iPhone using Tapatalk
     
    chubs likes this.
  4. bdm7250

    bdm7250 Guru
    Supporting Member

    Joined:
    Jun 3, 2016
    Messages:
    6,418
    Likes Received:
    16,332
    Trophy Points:
    113
    Location:
    Hamilton Ontario Canada
    My Bike(s):
    2008 BD Mastiff 2008 AIH Slammer
    First Name:
    Doug
    What have you done to your bike? Exhaust, cam, etc.?
     
    chubs likes this.
  5. bdm7250

    bdm7250 Guru
    Supporting Member

    Joined:
    Jun 3, 2016
    Messages:
    6,418
    Likes Received:
    16,332
    Trophy Points:
    113
    Location:
    Hamilton Ontario Canada
    My Bike(s):
    2008 BD Mastiff 2008 AIH Slammer
    First Name:
    Doug
    Morning, sunshine..:)
     
    chubs likes this.
  6. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    I changed the exhaust and the air cleaner. I used to have mean mothers and stock air cleaner and I installed hooker headers Darkside big radius pipes and an S&S Dual Runner


    Sent from my iPhone using Tapatalk
     
  7. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    I have had the V&H Big Radius in the past and I installed BCT baffles and that solved the problem. However the Darkside B&R is 2.5" O.D. and 2.25 I.D. and big city thunder baffles only make baffles for 2.25 O.D. So I am trying to fail in the jets and air fuel mixture.


    Sent from my iPhone using Tapatalk
     
    chubs likes this.
  8. BWG56

    BWG56 Guru

    Joined:
    Jul 29, 2008
    Messages:
    20,927
    Likes Received:
    36,848
    Trophy Points:
    113
    Location:
    USA
    My Bike(s):
    Big Dog, SpyderF3
    First Name:
    Ker
    Try this:old2:
     

    Attached Files:

    Rottweiler, bdm7250 and chubs like this.
  9. BWG56

    BWG56 Guru

    Joined:
    Jul 29, 2008
    Messages:
    20,927
    Likes Received:
    36,848
    Trophy Points:
    113
    Location:
    USA
    My Bike(s):
    Big Dog, SpyderF3
    First Name:
    Ker
    :disappointed:
     
    chubs likes this.
  10. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    Okay thanks I have .032 and a .076 and I was wondering if I should try the .033 and .078 combo.


    Sent from my iPhone using Tapatalk
     
    chubs and dentdude36 like this.
  11. BWG56

    BWG56 Guru

    Joined:
    Jul 29, 2008
    Messages:
    20,927
    Likes Received:
    36,848
    Trophy Points:
    113
    Location:
    USA
    My Bike(s):
    Big Dog, SpyderF3
    First Name:
    Ker
    Before you do that, did you try removing the Auxiliary bowl vent and readjusting the carb? look at the PDF, its #14
    With aftermarket air filters, this should be removed
     
    Big D Florida and chubs like this.
  12. BWG56

    BWG56 Guru

    Joined:
    Jul 29, 2008
    Messages:
    20,927
    Likes Received:
    36,848
    Trophy Points:
    113
    Location:
    USA
    My Bike(s):
    Big Dog, SpyderF3
    First Name:
    Ker
    What pipes and air cleaner are you running?
     
    chubs likes this.
  13. BWG56

    BWG56 Guru

    Joined:
    Jul 29, 2008
    Messages:
    20,927
    Likes Received:
    36,848
    Trophy Points:
    113
    Location:
    USA
    My Bike(s):
    Big Dog, SpyderF3
    First Name:
    Ker
     
    chubs likes this.
  14. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    Why would I do that I am running a S&S Dual Runner and it has the bowl vent built into the assembly. Does it need more venting than that?


    Sent from my iPhone using Tapatalk
     
  15. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    Hooker Headers Darkside Big Radius


    Sent from my iPhone using Tapatalk
     
    chubs likes this.
  16. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    Did it feel like it was stumbling kinda like it was beginning to run out of gas but only off and on while you were cruising at those speeds?


    Sent from my iPhone using Tapatalk
     
    chubs likes this.
  17. BWG56

    BWG56 Guru

    Joined:
    Jul 29, 2008
    Messages:
    20,927
    Likes Received:
    36,848
    Trophy Points:
    113
    Location:
    USA
    My Bike(s):
    Big Dog, SpyderF3
    First Name:
    Ker
    I am running the BR and the dual runner also with the vent removed because that's what they recommend you do, I tried 32 and 78 and at while cruising at 50-55 it would sneeze thru the carb, per their (S&S) carb adjustment guide, they recommended to bump up the inter a size, that's why I'm running 33 and 78 now without any hickups.
    You ask why would you do that? because its not running right now. Follow the istructions they have on the PDF, what you have to remember is no 2 bikes are a like because of tolerances, think about it, from .032 to .033 is .001. What if the tolerance is +/-.0005, you could have a .032 at .0315 and a ,033 at .0335, that's .002 difference. Is that going to make a difference? You bet it is.
     
    bdm7250 and chubs like this.
  18. BWG56

    BWG56 Guru

    Joined:
    Jul 29, 2008
    Messages:
    20,927
    Likes Received:
    36,848
    Trophy Points:
    113
    Location:
    USA
    My Bike(s):
    Big Dog, SpyderF3
    First Name:
    Ker
    :agree::stupid:
     
    bdm7250, chubs and dentdude36 like this.
  19. Spikes05

    Spikes05 Member

    Joined:
    Nov 8, 2016
    Messages:
    124
    Likes Received:
    187
    Trophy Points:
    43
    Location:
    Lodi California
    My Bike(s):
    05 bulldog
    First Name:
    Jerome
    Okay thanks I will set it up today with a .033 intermediate jet and a .078 main jet and I will pull the auxiliary bowl vent. I will let you know what happens tonight. Thanks again


    Sent from my iPhone using Tapatalk
     
    bdm7250, chubs and dentdude36 like this.
  20. BWG56

    BWG56 Guru

    Joined:
    Jul 29, 2008
    Messages:
    20,927
    Likes Received:
    36,848
    Trophy Points:
    113
    Location:
    USA
    My Bike(s):
    Big Dog, SpyderF3
    First Name:
    Ker
    :old2:Please do, we like to hear a happy ending:whoop::chopper:

    Just try removing the vent first before you bump up the jet
     

Share This Page