Question about 1993 Harley Davidson FXR Super Glide

3 Answers

How do i adjust a S&S super B carb, cold start mostly

Posted by on


3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 4,565 Answers

The Super B carb is not as forgiving of improper jetting as the Super E model carb due to the lack of an accelerator pump. The only adjustment you have on the carb is the idle mixture screw and idle stop screw. The idle stop screw simply adjusts the idle speed of the engine. The idle mixture screw should be adjusted somewhere between 3/4 and 1 1/4 turn out from the bottom. If it is out of this range, the carb is not jetted correctly.

Through experience over the years I've found that the Super B used on a Big Twin Harley should be jetted 29.5 on the slow jet with a 70 or 72 on the main jet. If used on an Ironhead Sportster, slow jet of 26 with either a 66 or 68 main jet.

The way to tune the carb slow speed circuit is to allow the engine to warm up and adjust the idle mixture screw one turn off the bottom. Then try to rev the engine. If the engine does not rev cleanly, try coming out a half turn on the idle mixture. If it seems to help, continue until it revs cleanly. If this is the case, you slow jetting is too lean, install a richer jet and repeat the above procedure. Once you get it tuned to where the engine revs cleanly with the idle mixture screw at one turn out, you low speed jetting is correct.

The high speed jetting is not quite as simple to set as this has to be done on the road. I usually find a long uphill run to test the jetting to keep top speeds reasonable. At about 55-60 miles per hour, roll the throttle on in high gear. Feel the way the engine pulls. If it pulls good, back off on the throttle about 1/8th turn. If it pulls better, it's just slightly lean. If when you roll the throttle on, the engine starts spitting back through the carb and doesn't run well, you are way lean. Either way move upwards on your jet size one step at the time and retest.

If the bike seems sluggish and blows black smoke when you do the "roll-on", you're too rich. Install leaner jet one step at a time.

Now, most people confuse a "mid range stumble" with a carb problem. All efforts to tune this stumble out done on the carb are futile. The problem is in the exhaust system. Most bikes do not like open drag pipes for street use. They will exhibit this mid range stumble. The remedy is to put a bolt with three nuts on it on the inside of the pipe or any other means to create just a bit of backpressure on the exhaust. This usually cures the problem or at least makes it easier to live with.

Full tuning procedures can be downloaded on the S & S site. Go to "Technical" page, then "Installation instructions" to download the full paperwork that came with your Super B.

I hope this helps and Good Luck.

Posted on Feb 04, 2010

  • 2 more comments 
  • wd4ity
    wd4ity May 19, 2010

    I assume this answer is for hsportyd74. Your best exhaust system is going to be a set of free flowing mufflered exhaust pipes. I like the Cycle Shack exhaust. They're good quality and reasonably priced. I ride a '94 Dyna Wide Glide with factory pipes and Screamin' Eagle mufflers. Very good setup. I get great power with 45-50 mpg. The main objective is free flow with a bit of backpressure. If sound is an issue for you, the bolts will not effect the sound of your drags, mufflers will quieten things down a bit.

    The old Ironhead sportys need a little backpressure to run correctly and avoid the "flat spot" that usually manifests itself at about 50-60 mph depending on the bikes gearing. I am familiar with the Big City Thunder Baffles but quarter inch bolts do the same job much cheaper. Initially, some people don't like the looks of them as they are something shiney inside the pipe. But, after a few miles, they're black just like the rest of the pipe and can't be seen. If you determine that you need more backpressure, simply install 5/16" bolts in place of the 1/4" ones. At a couple of bucks, you can't go wrong.

  • coilspring20
    coilspring20 Jan 21, 2011

    The answer given here is an excelent one and I have gone through everything that was described here with my S

  • coilspring20
    coilspring20 Jan 22, 2011

    One more thing I should comment on, is that by making the main air beed jet oriface, adjustable on the S

  • wd4ity
    wd4ity Jan 22, 2011

    Coilspring 20: For some reason your entire post is not coming through. I get something about the air bleed oriface and adjustable on the S, and this is where it stops. I've noticed this before on this forum. It seems like certain characters perform functions here than they usually don't on other sites. Do not use the upper case number keys, such as shift 7 to the and mark. Sometimes it cuts off your posting. Try it again and say S and S carb.


  • Level 1:

    An expert who has achieved level 1.

    New Friend:

    An expert that has 1 follower.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Another 100 percent right answer, guru, on my 79 ironhead i run cut off drag pipes and i purchased big city thunder baffles witch all they are is a baffle design that you install 6 inches into the end of the drag pipe it,s your tipical lolipop design only upside down, and wow what a differance, my question is what exhaust would you sugest running on my bike, iv,e read most of your post,s and you the man, honestly. thanx

Posted on May 19, 2010

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    Visited the website for 3 consecutive days.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 73 Answers

Well, here I thought I was gonna come on like a pro and give you the best answer. Looks like wd4ity already beat me to it. The best I can add, is that S&S link he told you about. Here it is and good luck to you.
Instruction Sheets for Performance Parts

Posted on Oct 25, 2014

1 Suggested Answer


6ya staff

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do I set idle on my homelite super2 chainsaw

Homelite XL 2 Automatic Chainsaw - YouTube

? 6:12
Apr 20, 2012 - Uploaded by Alec Ulm's Busted Knuckles
Homelite XL 2 Automatic Chainsaw ... free to shoot me a question or comment and I'll do my best to answer as accurately as I can . ... Homelite SUPER 2 Chainsaw OILER REPAIR & TEST RUN - Duration: ... HOW TO ADJUST A Homelite Carburetor - Duration: 5:01. by smallenginemaster1 177,482 views.

How to Adjust the Carburetor on a Homelite Super VI Chain ... > Construction & Remodeling > Siding
Homelite Super VI chain saws are equipped with a Walbro HDC diaphragm, and ...Adjust the idle mixture screw and idle speed screws clockwise one-quarter turn at a ...Homelite Super 2 Chain Saw Oil Type · How to Replace a Carburetor on a .... MyRidevisit'Cars-My Ride'navigation-www'4 · Sell Your Carvisit'Cars-Sell ...

Need carb settings for Homelite chainsaw - My Tracto

Jan 03, 2016 | Homelite Garden

2 Answers

Goped sport wont start has good spark, compression, axhaust is clean, air filter is clean.

The problem you are describing indicates a Lean (not enough fuel) condition. Are there any adjustment screws? If playing with the adjustment screws doesn't fix it, then I would try cleaning the carb again. I used to work in a lawn mower shop and I know these carbs can be very tricky. It takes multiple cleanings and compressed air. Now an afterthought. Is the choke adjusted and operating properly?

Sep 19, 2014 | Motorcycles

1 Answer

S&s super E carb adjustment

Hi Anonymous, for more information about your question please visit the websites below. Good luck and have nice day. Carb Jetting and Tuning Super Carburetor

Btw, I’m available to help over the phone in case u need at

Sep 17, 2012 | 1993 Harley Davidson FXR Super Glide

1 Answer

15hp Evinrude, to start must hold throttle firm towards acceleration position to start, when starts won't idle until hot

It sounds like your choke is not being used. If you are setting the choke, the carb is venting air somewhere. Take the cover off the motor and look at what is happening to the choke plate when you set the choke.

The choke plate should have either a vent on the butterfly plate if it closes tight or the butterfly plate should be ajar about the thickness of a credit card if the plate is unvented. Then check the mounting nuts on the carb base for tightness. If you want, you can put some ATV around the outside base of the carb to ensure its sealing.

Also note if there is a stepup cam for the choke RPM. This would increase the RPM with adjustment for cold starts and reduce the need to Throttle so much to cold start the engine. If it does not have this part thats Okay too, just a feature to be used if it is there.

Most likely your low speed idle mixture needs adjusting and its common to have the throttle capable of shutting off the engine without a killswitch. But try Cold starting it and see if sealing the carb base and adjusting the butterfly plate has helped. Then do the mixture adjustment if you are not happy with it.

If all this fails to help, have the engine running and try moving the throttle shaft with your fingers. You want to see if the throttle shaft has play where it pivots in the carb body. Its hard to explain but the extra venting of air can occur where the shaft rubs the casting. Depending on your talent it means you need a new carb or you need to rebuild the shaft.

Good luck on your motor.

Apr 23, 2010 | Boating

2 Answers

Does anyone know the carb. setting for a Homelite 45cc chainsaw. Or set up procedure??

Start 1.5 CCW from lighty seated then do as the link suggests.
Carburetor Adjustment by
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too.

Dec 28, 2009 | Homelite Consumer Products 9.0 Amp, 14 In....

1 Answer

How to adjust the carb on a McCulloch super

There is no set adjustment on any blower or chain saw. If it were that simple there would be no need for adjustments. The problem is that most equipment manufactured in the past 10 years can not be adjusted by the user. Carburetors are now equipped with either adjustment limiters which limit the adjustment to less than half a turn or with adjustment screws that require a special tool to make the
adjustment. More than likely you will have to take it to an authorized dealer for those adjustments.

If you do have an adjustable carburetor, then gently close both needles and open each on 1 full turn. This should allow the engine to start and the final adjustments can be made at that point. If it still will not start then open each needle 1/8 to 1/4 turn and try again. If this still does not work then most likely your carburetor needs a good cleaning and a rebuild kit.

Sep 20, 2009 | Garden

1 Answer

What is my lo hi carb adjustment for a Homelite Super XL ? with Homelite/Textron Div. Carb.

Start with 1 turn out from bottom on both and adjust from there as needed. The screw closest the engine is low speed mixture adjustment and the outer is high speed mix. adj. Hope that helps. Dwain

Jul 01, 2009 | Homelite Garden

1 Answer

Stihl Super Wood Boss 028AV sputters but won't run

sounds like the fuel pump is bad in carb get a carb kit and rebuild it and check the fuel line from carb to to the filter in tank and if that is a two stoke eng with oil in gas do not run on ether will most likely burn up eng

Mar 26, 2009 | Garden

2 Answers


its better to have it rebuilt......... it might be a float issue do u have black smoke when it first starts????

Oct 19, 2008 | 1981 Ford F 150

Not finding what you are looking for?
1993 Harley Davidson FXR Super Glide Logo

8,416 people viewed this question

Ask a Question

Usually answered in minutes!

Top Harley Davidson Experts

Arnie Burke
Arnie Burke

Level 3 Expert

5968 Answers


Level 3 Expert

4363 Answers


Level 3 Expert

85216 Answers

Are you a Harley Davidson Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides