Question about Harley Davidson FLSTF Fat boy Motorcycles

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I have a 94 fatboy with an S$S carb lately after the bike warms up the idle keeps going up .I have adjusted it with the engine at op. temp ,its fine for awhile but then starts going up again .

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Change the spring under the adjustment screw

Posted on Jul 26, 2009

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I have a 2002 fatboy and while it rides fine while cruising,it dies when I come to a stop.It wont idle unless I'm on the throttle


If your Fatboy is carb equipped you need to set the idle speed a bit higher. If you're still running the stock carb, remove the air cleaner cover. You'll see a square looking plastic top on the carb. Just to the right (toward the front of the bike) you'll see a screw. This is the idle stop screw. Turn it clockwise to increase the idle speed. Set the idle speed with the engine at full operating temp. It should idle at about 1000 RPM.

If your bike is fuel injected, you'll have to take it to a shop to get the idle speed set as it's done electronically.

Good Luck
Steve

Apr 10, 2011 | 2002 Harley Davidson FLSTF - FLSTFI Fat...

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Adjust carb on 2004 fatboy


If your carb is stock, the only thing you can adjust is the idle speed. The throttle stop screw is located at the top right of the carb. Turn the screw clockwise to increase the idle speed.

To adjust the idle mixture, you'll have to drill out the anti-tamper plug on the backside of the carb. This will require the removal of the carb from the engine. Turn the carb upside down and look just to the rear of the float bowl. Do not drill too deeply to remove this plug or you'll damage the idle mixture needle and they are NOT available separately from the dealer. Drill just deep enough to go through the plug. Tap the hole for a small screw, insert the screw and use a pair of pliers to pull the plug out. Some of them are in pretty tight. Put the carb back on the engine. Start the engine and bet it ot operating temp. Adjust the idle mixture screw for the best idle and then set the idle speed at about 1000 RPM.

Good Luck
Steve

Feb 11, 2011 | 2004 Harley Davidson FLSTF - FLSTFI Fat...

1 Answer

Bike keeps stalling.at first start up is normal choke out runs ok until it gets about warm up time to push in choke then it dies.will not start back up unless ing. And run switch are reset. Does not want...


Ok, Never use the enricher anymore than you have to. It's way to rich on every CV carb I've ever seen. It will foul your plugs. I start my bike with the enricher on but as soon as I can keep the bike running at a fast idle with the throttle tension screw on the bottom of the throttle grip, I set the screw to hold the idle at about 1500 RPM or so until the engine is completely warm on the top end. When the rocker boxes start to feel a bit warm, I'm ready.

Now, when Harley came out with the Twin Cam, I quit working on them. I work only on the older models, Evo powered and older. The reason is that Harley went to electronic engine control modules. This sounds a lot like what you've got.

To cure your idles problems, once you get your engine to full operating temp, set the idle speed using the throttle stop screw at the carb. Take the air cleaner outer cover off and you should be able to see the screw at the top front of the carb. Clockwise speeds the idle up. Now, the engine is not going to idle correctly until it is completely warmed up. That usually takes at least five miles of riding or so. Until then, you must keep the idle set with the throttle grip.

The alternative to this is a fuel injection system. And, you only think you have problems now. Read some of the problems those people have on this forum. I'll keep my '94 FXDWG.

Good Luck
steve

Sep 29, 2010 | 2000 Harley Davidson FXST Softail Standard

1 Answer

How do you adjust the carb on a 2.4 engine, 94 nissan pickup


You should have an air mixture and an idlig screw. The air mixture screw is set first untill engine idles evenly. then the idling screw is set untill the idling is as slow, being even, as possible. 800 to 850 RPM should do the trick. Then go back to air screw and FINELY adjust. Try to keep air filter onand make sure it is clean, new and not leaking air.

Jun 09, 2010 | 1994 Nissan Pickup

1 Answer

How to adjust carburator on 99 harley davidson fatboy


Only adjustment that can be made are to the idle, idle mixture and needle valve which requires some disassembly. Idle mixture should be mae when engine is warm. remove brass plug on bottom of carb ( need to drill out) be carefull, may need to remove carb. Install carb, warm up engine and adjust screw in or out to acheive best idle, then turn in 1/4 turn. adjust engine idle to 900- 950 rpm. If engine smokes under accel drop needle down 1 notch, if seems weak or hesitates under load, raise needle one notch, refer to Harley manual for specifics

May 28, 2010 | Harley Davidson Harley-Davidson Motorcycle...

2 Answers

2006 Suzuki Boulevard C50 engine dies


Even though you probably don't have that many miles on the bike, or if you do have a lot riding time on it, it sounds to me like you need a valve adjustment. That's a high reving bike for that engine that works pretty hard so you might have 1 - 3 loose valves.

Dec 07, 2009 | 2005 Suzuki Boulevard C50

2 Answers

2003 HD Fatboy has a miss. New plugs and wires.


i take it its carb. after it warms up to operating temps does it stop the sputtering? thats just a HD CV carb doing what it does til hot. Im not talking a 2 min warm up and off u go im talking operating temps of 200 plus. Is the carb an S&S? Your going to have high rpms til the temp kicks it down if its injected

Oct 04, 2009 | Harley Davidson Harley-Davidson Motorcycle...

2 Answers

Engine cuts out with clutch engaged.


idle adjust?
there SHOULD be an adjuster under the seat or gastank within easy reach. Clockwise to increase rpm, ccl to decrease rpm. idle around 1400rpm when engine is at normal operating temp. Good luck!

Aug 04, 2009 | 2002 Yamaha YZF-R1

2 Answers

Starting The Bike On A Cold Morning


The heater will not work.Do you pull the choke cable?Is your carb assemblies cleaned and adjusted properly?I assume that your fuel pump works fine.

May 29, 2009 | 1988 Yamaha FZR 250

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