Question about Harley Davidson Harley-Davidson Motorcycle Desktop Telephone

2 Answers

2000 Fat boy starts sputtering and lights flash on and off

I have a 2000 Fat boy. Starts fine but once it warms up after riding for a bit, it started coughing and sputtering and my rear lights started flashing on and off.

I am thinking it might be either points and connectors/coil or voltage reg. Any thoughts?

Posted by on


2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.


    An expert who has answered 200 questions.

  • Expert
  • 221 Answers

Well it's not points (there are none ) so now we have to figure out if it's elec. or fuel ? so after the motor has warmed up and idling spray soapy water onto or at the intake seals from the left side of bike if idle changes your intake seals are leaking, as far as the regulater goes there is no way to test (says harley ) other than a voltage output test, the primary coil grounds thru the ecm

Posted on Dec 28, 2009

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 23 Answers

Check you battery terminal connections. Can't think of any other reason that the rear light should be fluttering. If battery is tight then trace through your circuit breakers with a test light.

Posted on Aug 17, 2009

  • danellison Aug 20, 2009

    Sounds more like a wire is shaking in the wind and shorting out. Can't think of any reason that the coil or regulator would cause the rear lights to flash on and off.... Do you have plenty of clearence between your battery terminal connections and the frame? Same question for circuit breakers. There really isn't anything else that links engine misfire with tail light flashing on and off.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that 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 repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

2 Answers

My 2000 park avenue starts fine but once it warms up it spits and sputters then dies and it wont start

If it is backfiring and dying I would be willing to bet you have a crank angle sensor going out when it get warmed up. Also check to see if your fuel pump is running by listening in the gas door with the cap off. I have had them do this when the fuel pump gets hot it quits pumping fuel.

Oct 02, 2017 | Cars & Trucks

1 Answer

5.3L dont want to start when cold but once its warm it starts everytime

Have you checked the fuel pressure regulator to see if its leaking?

Jan 26, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

Normal for oil light to be on before starting 2000 fatboy

Any time you start the vehicle, it is normal for all of the service lights to come on for a few seconds and then turn off once vehicle is running. It is the system performing a self diagnostic check.

Sep 10, 2012 | 2000 Harley Davidson FLSTF Fat boy

1 Answer

2000 harley fatboy will not stay running shuts off

Hi Anonymous, take a ride or trailer your bike over to your local dealers service/parts department, I'm sure they will be happy to take your Harley Davidson for a test ride if necessary/possible and offer professional advice and assistance concerning your issue. Good luck have a nice day.

Apr 12, 2012 | 2000 Harley Davidson FLSTF Fat boy

1 Answer

My john deere lx 280 is running rough and sputtering

The problem is either withe the coils or with the ignitors,the ignitors don't usually cause the problems that you're discribing but the coils can come and go as the temperature changes so i would start there.

Jul 18, 2010 | John Deere Gator and riding mower deluxe...

1 Answer

Starts cold when warm shuts off

May be the fuel pump, experienced similar problems in 1995 Intrepid. When the pump warmed up, it would start to loose pressure and car would sputter and die, but would start back up. If it started it would usually begin sputtering again and eventually die.

Feb 03, 2010 | 2000 Hyundai Accent

1 Answer

2005fatboy keeps sputtering and stalling out has gas half full cant make it to dealer starts right up has 3000miles on it feels like running out fuel just dies out wait a minute start back up ride a couple...

Could be a fuel line restriction, bad petcock, problem with the vacuum line to the petcock if this is a carburated engine. Could be something as simple as a bad gas cap. Try loosening the gas cap just a bit and ride to see if does it then. Loosen the right side tank cap.

If it's fuel infected, I'm sorry but I can't help you.

Oct 03, 2009 | 2005 Harley Davidson FLSTF - FLSTFI Fat...

1 Answer

My 1982 honda xr 200 starts up but once it is warm, it runs rough

Flush the gas and fill it with fresh one and get back to me...

Sep 07, 2009 | Honda XR 200 Motorcycles

1 Answer

83 honda cx650 smoking one day not the next

The sputtering was a bit of water in the bad gas you got and the smoke was probably from a bit of diesel fuel that was put into a gasoline storage tank in error. The temp guage going bad is just one of those things that happen from time to time, probably just a bad sensor. The idle speed change is a bit quirky but easy to adjust. Stick a fresh set of plugs in the bike and the starting problem should clear up.

A “very helpful” rating for this answer? Thanks!

Jun 24, 2009 | 1987 Honda CBR 600 F Hurricane

1 Answer

749 Starting Problem

I don't think there's anything wrong with your bike. I'm assuming that all the required services have been done and you have a good battery. The **9 bikes absolutely require a good strong battery. If you don't already have one get and use a battery tender. It will save you a lot of headaches with a weak battery. As for the starter speed, the 749 turns over S-L-O-W-L-Y. It's normal, if you're use to other makes it sounds like it won't start but it will. The Fast Idle lever, not a choke, once you start the bike, let it idle about 2000 RPM or so until the coolant temp gage stops flashing, then you can slowly back the lever to minimum, if you if you just push the lever back fast it drops the idle too fast and it will die. When it's not fully warm and you have a stock injection map it runs a little lean and will be cold blooded until fully warm. The occasional stall on a cold morning is not unusual even on a properly set up bike. I normally on cool mornings keep my fast Idle lever up until I'm either on a highway/freeway or a five or so miles in town before I turn it full off. She can be a real bitch to start if she's only a little warm, not cold/not hot, I really don't know why but mine does the same thing. I give it a minute and try again and she'll fire. All this goes away once she's fully warmed up. Once you get the knack of it you'll be fine, I don't even really have to think about it anymore.

Nov 20, 2008 | 2005 Ducati 749 S

Not finding what you are looking for?
Lands Phones Logo

155 people viewed this question

Ask a Question

Usually answered in minutes!

Top Harley Davidson Lands Phones Experts


Level 3 Expert

102366 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

ted dux

Level 2 Expert

135 Answers

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

Answer questions

Manuals & User Guides