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Sportster Carb Coughing

  #11  
Old 01-11-2019, 01:49 PM
Kawickrice
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Originally Posted by perki48 View Post
I would drain fuel tank and carb bowls and replace with fresh fuel to start with. If that does not work then I would go on to cleaning/rebuilding carbs.
Yeah this
 
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  #12  
Old 01-11-2019, 02:00 PM
Kakha Barnovi
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Originally Posted by perki48 View Post
I would drain fuel tank and carb bowls and replace with fresh fuel to start with. If that does not work then I would go on to cleaning/rebuilding carbs.


Looks like 2 of us posted same thing at same time.....LOL
Ok. maybe the old fuel affects on caughing, but does it affect on backfiring thru carb?
 
  #13  
Old 01-11-2019, 02:07 PM
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perki48
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Originally Posted by Kakha Barnovi View Post
Ok. maybe the old fuel affects on caughing, but does it affect on backfiring thru carb?
YES!...........fuel not burning creates LEAN mixture.
 
  #14  
Old 01-11-2019, 02:22 PM
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Originally Posted by perki48 View Post
YES!...........fuel not burning creates LEAN mixture.
Ok sir. I`ll check that out. I will clean tank, empty carb. Then fill up tank and ride
 
  #15  
Old 01-11-2019, 02:25 PM
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Originally Posted by Kakha Barnovi View Post
Ok sir. I`ll check that out. I will clean tank, empty carb. Then fill up tank and ride

And if that does not work you may need to clean carbs to clear plugged passages/jets..........good luck.
 
  #16  
Old 01-11-2019, 03:16 PM
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She's running lean. Did you alter exhaust or intake. If so rebuild with CVP kit. Not expensive around 60 or so.
CV performance
 

Last edited by Tileman2692; 01-11-2019 at 03:19 PM.
  #17  
Old 01-11-2019, 03:25 PM
John Harper
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Originally Posted by Kakha Barnovi View Post
Yes. Idle/Mix screw is properly set.
How many turns out is "properly set?" Mine's set at about 2.5 turns out, no carb pops.

When was the last time you changed the manifold seals at the heads?

If it sat for a year, very likely some passages or jets have some residue built up, need to clean all those "boogers" out.

Have you tried Seafoam gas treatment? It worked well on my 1991 before I did a complete carb rebuild and replaced manifold seals.

John
 

Last edited by John Harper; 01-11-2019 at 03:29 PM.
  #18  
Old 01-11-2019, 05:20 PM
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These guys have what you need.

https://cv-performance.com/carburetor-parts/
 
  #19  
Old 01-12-2019, 12:36 AM
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Originally Posted by John Harper View Post
How many turns out is "properly set?" Mine's set at about 2.5 turns out, no carb pops.

When was the last time you changed the manifold seals at the heads?

If it sat for a year, very likely some passages or jets have some residue built up, need to clean all those "boogers" out.

Have you tried Seafoam gas treatment? It worked well on my 1991 before I did a complete carb rebuild and replaced manifold seals.

John
I have changed my manifold seals, They are brand new.
 
  #20  
Old 01-12-2019, 01:19 AM
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Coughing through the carb is a sign of the pilot jetted too lean.

Here is a good vid about jetting.and tuning. Shows symptoms of main and intermediate jets too lean and too rich.

It could also be your idle mixture is too lean.
 

Last edited by hscic; 01-12-2019 at 01:21 AM.

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