Question about Harley Davidson FXR Super Glide Motorcycles

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I have a 91 FXR that was professionally rebuilt. I added straight pipes to the bike and now it runs terrible. I'm using an E carb, does anyone know if there's problems with this combo?

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  • Harley Davidson Master
  • 1,554 Answers

Yes, there is!
Straight pipes never run right, except at wide open throttle on the track.
Beings you're running a (S&S) E carb, read item number 10, here:
It says, "NOTE: Drag or straight pipes can prevent you from obtaining optimum carburetor performance."
You didn't say if you were running the standard S&S air cleaner or not, but line 11 states" If the S&S teardrop air cleaner is being replaced with an aftermarket air cleaner be sure to remove the auxiliary bowl vent screw. Never use a velocity stack on a street driven motorcycle! Poor throttle response will be experienced."

Posted on Aug 02, 2013


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Hi Chris,

You can download the service manual for nix from here. trying to picture what you are looking at, but if they are the only rubber hoses coming off the carby, then they are most probably the fuel lines. If they come off the very top of the carby, then they may be breathers. The bike has a vacuum operated petcock also, you will need to have it in prime position for the carbs to fill. Then once the engine runs, if the petcock os working correctly, then you should be able to get fuel in on position. Just cranking it over will not created enough vacuum for the carbies to fill.,hence the prime setting. Happy to answer any questions you may have about the bike, A FixYa rating is a great reward for my efforts to assist you. Cheers


Posted on Nov 13, 2008

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SOURCE: 91 kx 250 stock carb setup.

Low speed screw 1.5 turns out from bottomed. Middle position for clip #3 position.
I never rely on the factory settings for the low speed screww, set it to factory and keep adjusting it 1/8 turn at a time until idle sounds best and quick throttle blips dont sound "stumbly" the later being the most important.

The needle position is for low altitude.

Posted on Jan 26, 2009

  • 53 Answers

SOURCE: rebuilt carbs-starts and idles but wont rev up without choke on

sounds like the main jets are partly pluged, you must remve all brass jets and seats including needle jet and its slide soak in carb cleaner and blow out with compressed air only.. hold up to bright light to verify if all are clean. jim

Posted on Mar 29, 2009

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SOURCE: 1979 suski 750,bike runs on 2 left side cylinders,

Hi and welcome to FixYa,

With the indulgence of craigjamesbt...

A few additional ideas to consider:

  • it would be an electrical/ignition issue if 1 & 4 or 2 & 3 will not fire but not 3 & 4;
  • almost always, raw fuel on exhaust indicates a flooded engine. A flooded engine would most likely be a carb issue;
  • best way to determine if it is an engine concern is to do a compression test;
  • a way to test the right carb pair is to deliberately starve them of fuel by temporarily plugging/blocking the inlet port/seat with rubber similar in appearance as to those used for glue gun, not installing the needle and float. Assemble the carb and install. Start the bike and use/spray carb cleaner on the right side carb. Note if 3 & 4 will fire even intermittently.
Would appreciate a postback on results/updates on any developments.

Good luck and thank you for using FixYa.

Posted on Apr 27, 2009

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SOURCE: suzuki rmz450 is stalling when clutch is let out.

Carb may need tuning

Posted on Apr 30, 2009

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The jets are for increased performance but the jets installed must be in relation to the pipe used. An open pipe would require larger jets. If the jets came with the pipe when the previous owner purchased it, then it should work. My advise would be to tune it up, sync the carbs, and time the sparks.

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Hi and welcome to FixYa,

Initially, if there is spark on the plug of the front cylinder, then it would be a fuel issue. Pls try:
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  • Remove the airbox assembly to expose the carb;
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  • might require a rebuilt.
Good luck and Thank you for using FixYa. Happy New Year.

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