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S&S Shorty Carburetor Adjustments

Gettin Back To Baseline

Photos and text by Howard Kelly
6/10/2010 9:37:41 PM


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Carb1

Editor’s Note: We are going to work with S&S, Baker, BDL, Compu-Fire and other Bikernet Sponsors, on their most asked tech questions. We’ll try to deliver the info you need access to. The following came from Howard Kelly, the former editor of HOT BIKE, and now an S&S tech editor.

“We take tech calls all day long here,” Howard said. “Most people have monkeyed with their carb so much they lose the baseline. Before we can do anything else, we have to get them back to a starting point so they can tune the carb to their bike. These 10 simple steps make tuning an S&S Super E or G a breeze--on the road or in the garage.”

Carb2

1-Verify carburetor is set to stock settings:
A. Idle Mixture Screw, 1 1/4 turns from lightly seated
B. Idle Speed Screw, ½ turn clockwise from engagement point
C. Accelerator Adjustment Screw, 2 turns counterclockwise from seated

1. Start bike, bring to operating temperature. Close enrichener as quickly as possible.

2. Set Idle Speed Adjusting Screw, clockwise to increase rpm, counter-clockwise to decrease rpm

3. Adjust air/fuel mixture by turning Idle Mixture Screw slowly clockwise until the engine runs poorly. Slowly turn the screw counter-clockwise until it runs smoothly—if you go too far the engine will start to stumble.

4. With engine idling, turn Accelerator Adjustment Screw clockwise until it lightly seats. Snap throttle open—engine should stumble. Turn screw counter-clockwise ¼ or ½ of a turn at a time, until engine responds to throttle twist with smooth, quick response.

5. Ride motorcycle in various RPM ranges, and then try to maintain a consistent 40- to 50-mph. If the engine is popping or sneezing in the air cleaner it can indicate a lean condition. If you notice stumbling or sputtering it can indicate a rich condition

6. Replace Intermediate Jet as necessary—smaller is leaner, larger is richer. Adjust Idle Mixture Screw and Idle Speed Screw as required.

7.To test the Main Jet, do a high gear roll-on from 50-mph to 70-mph. If the engine back fires or breaks up in the carb, increase the Main Jet size .004”. If the engine is flat or will not accelerate, decrease the Main Jet by .004”.

8. After changing the jets, test ride the motorcycle. Continue re-jetting and adjustmenting until optimum performance is achieved.

Note: Drag or straight pipes can prevent you from obtaining optimum carburetor performance.

Carb3

Howard Kelly
S&S Cycle Inc.
235 Causeway Blvd.
La Crosse WI 54650
(608) 627-0284

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Reader Comments


I have a 2001 Dyna with a recently rebuilt S&S Super E. I can get it to start briefly if I really rap on the throttle but it won't run. Seems as tho my main jet circuit is not working as it should...have pulled the main jet, it's clear. Bowl is getting fuel and the float is seating. Any thoughts?

John Askham
Miami , FL
Wednesday, April 17, 2024
Editor Response A million questions. Have you run ethanol fuel? Has the bike set without running for any length of time? Is the choke closing when it's running. Check for dirt.

Did it run fine before? Let me know.

Hey, I double-checked the mid-range jet. It has a needle-sized hole through the center. Make sure it's clear.

--Bandit
I have a '96 1200C Sportster with S&S super E and Vance and Hines short shots. How can I adjust to get rid of the decel popping?

Anthony Kasprzak
Reinholds, PA
Saturday, September 30, 2023
Editor Response Popping during deceleration is generally due to an exhaust leak. Usually at the heads. Check it out.
--Bandit
I have a 2001 Softail Deuce with à fresh top end rebuild.
Had Andrews 37 cams put in, and I have an S&S super E carb with à 74 main jet and à. 0295 intermediate jet. When I adjust accelerater pump, I can't get it to dial in just right. Any ideas would help

Andy young
BRAZIL, IN
Friday, March 24, 2023
Editor Response How do you mean. Are you starting it with the choke? If you do, give it a couple of squirts and then don't touch the throttle.
--Bandit
Comprehensive and well-written, pretty much covers everything, but could have touched on air leaks, which must be addressed if carb is going to function properly at all.

Phil
Molalla, OR
Saturday, January 28, 2023
Editor Response You're right. Feel free to share a tech tip, and I will share it with our readers.
--Bandit
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