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  #1  
Old 06-10-2009, 09:29 AM
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Default Engine Cough

I have a 93 Softail with 52,000 miles. About a year ago, I noticed the engine would cough one time every 40 or 50 miles, usually when gradually accelerating out of a curve. I lived with it as I replaced the coil, plug wires and plugs, thinking it was an ignition problem. No improvement.

Recently when I started a short ride, I forgot to turn on the fuel. After I turned it on, the engine caught up but then really coughed badly for 20-30 miles. I then suspected a fuel problem and through trial and error found that I can pull the choke out exactly 3/16" the coughing stops. Rode 200 miles recently without any coughing problem.

Am I compensating for another problem or can the choke cable be adjusted for the 3/16"????
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Old 06-10-2009, 11:33 AM
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Default Re: Engine Cough

By far I'm no mechanical whiz, but does the bike have a screen or fuel filter that could be gummed up?
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Old 06-10-2009, 01:26 PM
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Default Re: Engine Cough

I'm not much of a bike carb man but in the 4 wheel world if you are having to compensate that much choke you have deeper issues. May want to try running some carb cleaner through it before digging deeper. A little Berryman's B-12 while you have it running at a higher idle. Just my 2 cents.
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Old 06-10-2009, 01:58 PM
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Default Re: Engine Cough

I drained the fuel tanks and put in new gas. The screen in the tanks looks perfectly clean. Don't know if there is another filter or not.
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Old 06-10-2009, 02:07 PM
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Default Re: Engine Cough

If you are pulling the choke out then the you are reducing the air flow which makes the mixture richer. Could there be some trash in the float bowl or maybe one of the jets partially plugged? I guess it could even be a leak in the intake which would also lean the mixture some. I don't think you hear intake leaks and it seems like it would idle bad.
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Old 06-10-2009, 03:17 PM
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Default Re: Engine Cough

Yep...definately sounds like your bike has developed a lean running condition. You say this started about a year ago. Did you make any intake and/or exhaust changes/modifications at the time...air filter/cleaner...pipes/mufflers ??
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Old 06-10-2009, 03:41 PM
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Default Re: Engine Cough

Like Ken & spade sugg'd, I would suspect a lean condition possibly from an intake leak since it seems to be new (as of a year ago)..

It mighta always been there & you just never noticed until a year ago or possibly a small intake leak has developed..
If this were my sickle I would spray the intake seals and the carb to manifold connection..

However, if there is NO intake leak you may want to fatten up your A/F mix especially in the RPM range that the cough occurs----- prob in mid-range huh..

You might wanna do a High-spd and a Low-spd plug test to be certain..
Remember,, checking the plugs after idling in to the Compound ONLY shows what the idle mixture is..
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Old 06-10-2009, 03:59 PM
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Default Re: Engine Cough

Had the intake manifold gaskets replaced a couple of months before I experienced this problem. No other changes were made as far a I know. I am not a mechanic so I only go on what the mechanics tell me. The engine is smooth at idle and cruise speed...except this occasional cough. Should I have carb rebuilt and make sure jets have not been changed?
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  #9  
Old 06-10-2009, 04:08 PM
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Default Re: Engine Cough

Like the others have said that is a lean caught.
Drill out the idle adjustment plug and screw out the idle adjustment half a turn.
The choke on the CV is really an en-richer, so running that way does the same thing but does not take the place of doing it right.
If screwing the idle adjuster does not take care of the problem then you might want to go one idle jet size larger.
This is something any “Handy guy” can handle. Just a little intimidating at first.
As far as adjusting the en-richer cable, there is a plastic nut under the knob that can be tightened to keep it at any position, but like I said, do it right, running to rich is just wasting gas, fouling plugs and putting your emissions off the scale.


Quote:
Originally Posted by thetnfolks View Post
I have a 93 Softail with 52,000 miles. About a year ago, I noticed the engine would cough one time every 40 or 50 miles, usually when gradually accelerating out of a curve. I lived with it as I replaced the coil, plug wires and plugs, thinking it was an ignition problem. No improvement.

Recently when I started a short ride, I forgot to turn on the fuel. After I turned it on, the engine caught up but then really coughed badly for 20-30 miles. I then suspected a fuel problem and through trial and error found that I can pull the choke out exactly 3/16" the coughing stops. Rode 200 miles recently without any coughing problem.

Am I compensating for another problem or can the choke cable be adjusted for the 3/16"????
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Last edited by HarleyCruiser; 06-10-2009 at 05:02 PM.
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  #10  
Old 06-10-2009, 04:19 PM
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Default Re: Engine Cough

Hi Tn

HA,, Ken asked the correct ?????'s..
Since the prob started After the seals were changed that is a very likely first place to look,, Ken gets the Gold Star..

Spray the seals and also the carb to manifold connection..



Now--- if it does not show an intake leak then it is still prob a lean condition cuz a cough is a lean indicator..

Do you know how to do the plug test,, just in case.?
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