S&s carb and poppong noise in warm weather?

Discussion in 'Engine, Fuel and Exhaust' started by dvndogbagger, Aug 10, 2010.

  1. dvndogbagger

    dvndogbagger Member

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    So I live in maine and the weather changes from day to day, I justed picked this bike up a week ago and did a bike run up to sugarloaf mountain 70's day 50's night and the bike ran great!

    Now I took it to work today and it is humid and warm probably mid 80's and I noticed some vague popping noise possibly backfiring is this typical and can it be fixed?

    I am not sure if it is jetted but my guess would be yes.

    Thanks for all help
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Carbs are funny that way, but tuneable check your main jet size Thats one more reason for EFI but SS is a very good carb and easy to get parts for:s
     
  3. R. Lewis

    R. Lewis Senior Member Retired Moderators

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    How about adding some Sea Foam or something simular for now and see if its stilll popping?
     
  4. dvndogbagger

    dvndogbagger Member

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    I will try some sea foam thats a great idea, I love that stuff I have 3 cans in the garage. Another thing is the previous owner told me on the S&S carb you should shut the gas valve every time you ride due to gas flowing back in your crankcase?
     
  5. dvndogbagger

    dvndogbagger Member

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    So I put on about 300 miles this weekend and added the seafoam to the tank according to specs. Still had some popping out of the carb issues, I am wandering if it running a wisker to lean? I forgot if turning the idle mixture screw in or out is leaner or richer?

    I was always told turn the screw in when engine is warm until it runs rough and then back out until smooth.
     
  6. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    Idle screw. Jack the rpms up in the 1000-1200 rpm range. Tweak the mixture screw for best idle, then back off another 1/8-1/4 turn. Try it.

    But popping is sometimes a symptom of an intake leak. Check this out:

    Finding An Intake Leak - Harley Davidson Community

    TQ
     
  7. Jack Klarich

    Jack Klarich Expert Member

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    Another thing to check is intake alignment, HD makes a tool for this or you can use triangles to check for proper alignment:s