Question about 2005 Harley Davidson FXD - FXDI Dyna Super Glide

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Adjustment need to know where the adjustment screw is on the carb.

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Is it fuel injected?

Posted on Mar 13, 2009

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I have a 1980 Harley Davidson and when I put gas down the carb it runs good. I have had the carb rebuilt and still the same problem. I can't figure out where the adjust screws are at? The adjustment...


YOU MIGHT NEED A NEW THROTTLE CABLE..IF THEIRS NO MORE ADJUSTMENT IN IT..IF YOUR SET SCREWS AREN'T MAKING ANY DIFFERENCE THE POINTS ARE FLATTENED OUT AND NEED REPLACEMENT.WITH BIKE RUNNING AFTER TURNING THEM ALL THE WAY IN THE MOTOR SHOULD DIE IF NOT THERE NO GOOD..COME FROM OVER TIGHTENING..THEY SHOULD SEAT WITH LITTLE PRESSURE..GOOD LUCK..THE ADJUSTMENT SCREWS ARE IN BETWEEN THE MOTOR AND CARB AND BETWEEN THE AIR FILTER AND CARB..THIS IS USUALLY THE ONE USED FOR FINE TUNING..I KNOW HARLEY MECHANICS COST ALOT BUT THEY REALLY ARE WORTH THERE WEIGHT IN GOLD AS LONG AS THERE A SEASONED MECHANIC..ID TAKE IT IN FOR A TUNE UP WITCH WOULD INCLUDE CARB ADJUSTMENTS..BECAUSE WITHOUT THE PROPER KNOWLEDGE AND TOOLS ITS ONLY SO GOOD..BEST IS WITH A FLOW METER WITCH BALANCES THEM PRECISELY,,TO EPA STANDARDS..AND HARLEY S OF COURSE..KEEP THE RUBBER SIDE DOWN..

Feb 21, 2015 | Harley Davidson Motorcycles

1 Answer

I need to know the proper tuning of ucal mikuni carburetor with mixture adjusting screw on bottom of cabr (beneath float bowl), an idle adjust screw and pilot screw (hopefully pilot fuel screw since s


Why did you need to clean the carb? Routine servicing of the aircleaner would keep the carb clean for life. The pilot screw should be 1.5 turns out approx. with a small adjustment either way. Idle speed is set to a smooth low idle.If this doesn't fix it have you got something in the carb not replaced correctly? The float needle/float assy? How did you clean it? Have you introduced fluff/dirt into the carb and did you blow it clean with an airline?

Oct 09, 2014 | Motorcycles

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How do I adjust the carb?


there are two screws on the outside of the carb the bigger one with knurling on it is the idle control screw the other one is the air to fuel control screw. It may be necessary to adjust both but try the idle screw first. It may need more adjustments as it warms up. Just mess with it until it idles thr way you want it. Hope this helps.

Sep 04, 2012 | 1971 Honda CB 100

2 Answers

Hi I have an '81 yamaha virago 750,I don't know how to adjust the carbs,it getting too much gas and I was told I needed to close the gas off and open the air.....????


Below is a diagram. Turn the air screw inward until it lightly seats then open it up two turns. Set the idle speed with the throttle screw. The throttle screw pushes against a lever on the outside of the carb. From there, adjust the air screw for best idle speed. Do this for both carbs. Be sure the air cleaner is clean.
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Apr 25, 2011 | Yamaha XV 535 Virago DX Motorcycles

2 Answers

Need to know about carb adjustment for tomos st sept 2010 question 1 the screw adjust questtion 2 finger turn adjustment what do either do and if totally screwed in how many turns out do i do...


LIGHTLY seat the air screw and the throttle screw. Now open both of them up one and one-half turns. Adjust idle speed with the throttle screw. Normally, the throttle screw sticks out about 1/2" to 3/4" from the throat of the carb. The air screw is short and usually recessed. If the screws have been tightened down anything more than lightly, the screw seat may have indented the screw face. If the face is ringed, the engine usually will not run well. The screws would need to be replaced. Please rate my answer. Thanks.
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Apr 08, 2011 | 2008 Tomos Se 125 F

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I need to know how to adjust the fuel ratio on my 2008 Keeway arn 150 that has an electronic adjustment on it.


check for a small brass screw on the carb. if it is on the filter side it is a air adjust screw, turn it out to lean out the carb. if it is on the intake side, it is a fuel adjust screw, screw it out to make it richer. the easiest way to adjust is to turn it slowly one way or another until you get the highest idle without touching the throttle, then adjust back down with the idle adjust screw.

Jun 13, 2010 | 2008 Keeway F-act 125

1 Answer

Need to adjust my honda shadow 500 vt carburator's fuel/air mixture


start by synchronizing your throttle plates. Honda calls the next step the "idle drop procedure". u need to know if you have fuel adj. screws or air adj. screws. fuel screws will be on engine side of carb slide, air screws will be on airbox side of carb slide. start leaning out mixture, (turn in fuel screw, turn out air screw. idle will increase so keep adjusting idle back to spec.after each turn if needed. Adjust about 1/4 to 1/2 turn at a time on each carb until there is no change in idle, then richen up mixture by one half turn. If u sync throttle plates first then follow this procedure, there should be no hesitation when you "blip" the throttle, and after revving it should return to idle smooth,

Apr 08, 2010 | 1986 Honda VT 500 C Shadow

1 Answer

1995 FLSTF 80CI Carburator bike not passing emissions


If you're talking about simply adjusting the idle mixture screw, you need to turn the screw inwards to lean it out. But, if you can get to the idle mixture screw, your carb has been modified as this screw has a "anti-tamper" plug covering the screw. The mixture screw is on the back side of the float bowl facing upwards.

More than likely, it sounds as if someone has rejetted the carb. That year model CV carb came with a a #42 slow jet in the carb. The modification to make them run better was to go to a #45 slow jet. This was in the original Keihen 40mm CV type carb. You can try to adjust the mixture screw and see if that allows you to pass. If it doesn't, repost and let us know. Maybe we can help you rejet your carb. Good Luck!

Jan 26, 2010 | Harley Davidson FLSTF - FLSTFI Fat Boy...

1 Answer

I know its a stupid qeustion but where exactly on the motorcycle is the air screw and throttle screw. I have a 2007 Suzuki rm125.


The air mixture needle valve is on the Carb. Throttle screw as you call it, you might be referring to 1- throttle adjustment at the twist throttle hand grip. 2- At the top of the carb is a throttle cable adjustment 3- some times somewhere between the twist grip and the carb there is an adjustment.4- there is also a idle adjustment at the carb.3a37cbb.png

Dec 18, 2009 | 2003 Suzuki RM 125

1 Answer

1977 750gs carb sync


carb sync is done using only the carb hard stop adjustment u don't touch the air fuel mixture screw, had this exact same bike had the serive manual am dead sure on this

Aug 04, 2009 | 1977 Suzuki GS 750

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