Question about Harley Davidson Harley-Davidson Motorcycle Desktop Telephone

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2008 fatboy repairing front end hit,bike has intermittent spark,replaced broken voltage reg.,checked crank sensor ok.leftt side regulator wires may have had some stress on them but do not see anything visual.if i hit the sarter button quickly and then crank it will spark continuously.if i stop and try again it wont spark.

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How good is the magneto on it? just a guess but it does create the spark

Posted on Sep 19, 2008

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3 Answers

2006 HD Fatboy FLSTFI minimal throttle position misfire


I would also check for a vacuum leak (intake manifold seal) or a faulty throttle position sensor. Check the intakes first, hold the motor steady above idle and squirt some carb cleaner where the manifold connects to the head. If the motor jumps up in speed right away, you located the leak. A quick shot is all you need to check. Replace both seals at the same time.

The throttle position sensor would need to be checked with a multi-meter. If the sensor (potentiometer) does not change resistance smoothly, it can become "lost". With the engine off, you can disconnect the plug and measure the resistance across the sensor. Get a extra hand to work the throttle from idle to WOT slowly. Watch the resistance change on the meter. If the reading jumps around or goes "open" while moving the throttle, the sensor is faulty.

Jan 21, 2010 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

I have a 97 Fatboy that sometimes loses spark


test or replace your ignition module,and you might find the actual prob by accident the connector for the module sometimes with age lose or only have intermittant contact.a can of electrical contact cleaner should take care of it but those symptoms scream ignition mod dont know why hd dealer couldnt find it but they dont put their best techs on older bikes

Jul 15, 2009 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

My bike was runing good it,s a94 fatboy the other


Sounds like your voltage regulator is bad or come unplugged

May 09, 2009 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

2003 883 sportster wont start


What u are describing is typical of a faulty ignition system, but could also be a fuel problem. I check by removing the aircleaner and rotating the throttle. If u see a nice spray of fuel, thats probably not the problem. Check for a spark at the plugs. I can explain how if you need me to. If you cant see a good spark, U have an electrical problem. I had a crank position sensor go bad on me. Dont do what I did (replaced the battery, ignition, and regulator as part of my diagnosis procedure)

Nov 08, 2008 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

1995 fat boy- harley davidson


This is going to be a problem that will need to be tracked down because there are several things that could cause this. It's going to be in the electrical system, and any one or combination of the following can cause this, Faulty switch, especially the ignition switch, bad wiring which could be a bad connection, loose ground, bare wire, or broken wire, These are the two cheapest, but the hardest to find. Now, it can also be a bad or malfunctioning ignition module, coil, voltage regulator, and magneto assembly. You will have to test each of these. I recommend that you start at the spark plug end and work your way back since most of this is in line and work in conjunction with each other. Keep in mind that this being an intermittent problem, it may be extremely hard to find.
I also have a 95 Softail, and recently had a similar intermittent problem, turned out that there was a hairline crack in the regulator, and the problem would only occur if the regulator was warm enough for the crack to open a bit. I also traced the wiring harness, found and replaced several wires that were in bad shape, thinned, stretched, corroded, etc... You will be amazed at how much wear the wiring harness will have on a 13 year old bike.
Don't let this discourage you. In my opinion, the mid to late 90's models are the best HD ever built, and the Evo is by far the best engine. With the newer bike you have to worry about things like, crank and cam sensors, ECM's, fuel injection, and all the other electronic BS. It's to the point that the average rider can't work on his/her own bike, which is getting away from the HD tradition. That's a great bike you have, keep it for a long time. I may buy a newer bike someday, I don't know, but I do know that I will always keep my 95. Good luck with this and be safe.

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Sep 15, 2008 | Harley Davidson Harley-Davidson Motorcycle...

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2002 harley fatboy will not start


Let me start by saying I've owned Harleys for twenty years and do all my own work, so don't let the computer expertise on my profile detour you from taking my advice. There are several things that can cause a no start, you'll need to narrow it down to either a fuel problem or a fire problem. Start by checking the spark. Take a plug out, ground it to the head, and crank the engine. If there's is no spark then you need to start tracing it back. Check the coil, ignition module, and voltage regulator connections and wires. Most of the time when you lose fire it's a loose or broken wire/connector, or the coil or ignition module has failed. The regulator can cause a loss of spark, but generally only causes the battery to go dead. Rare, but occasionally the magneto will go out. If you have a good spark, then check for fuel. Turn off the petcock and take the fuel line loose at the carb or injection end, then turn the petcock back on and see if you have fuel getting to the carb/injection system. If not, then you have a faulty petcock, or a plugged screen in the petcock. If you are getting fuel, then, if carbureted, take the carb off, clean it, and check the jets and other internal workings. If this is an injected model, I'm afraid you'll have to take it to a shop that has the diagnostic tools to read and calibrate the injection system. Wow, this is starting to get long winded. Try these and let me know, I have a wealth of knowledge available to me from guys I ride with.

Aug 06, 2008 | Harley Davidson Harley-Davidson Motorcycle...

2 Answers

Bike cranks but will not start. Was fine when I last drove it. It has fuel . what could I do next


pull sparkplug out, rehook plug wire on plug. ground plug against cylinder and
check for spark. no spark? have coil checked

Jun 30, 2008 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

1998 dyna wide glide


check fuel level and petcock.getting fuel? next check for spark ground spark to cylinder fins and crank motor, no spark check cam postion sensor for voltage while cranking (if fuel injected check crank positoin sensor for voltage) if you get voltage replace coil

Jun 20, 2008 | Harley Davidson KNG America 026711...

1 Answer

Dyna Superglide 2002


hey debbie hows napolean? start with the battery bud new don't mean a thang it could be bad off da shelf right. check it and cables and connections for goodness then get a regulator and slap it on there cuz it only 50 sumpin dolla and the alty is buried in the primary and hardly ever ever ever go bad within 8 years unless you got a 'katrina bike' which i didnt know there was a katrina bike you can check the alty for output and all but the meter cost you and a spare reg never hurt no one and they are right thur in the front in the wind catchin the water and everyting and don't forget the cables can look good and be bad just like me!

Apr 14, 2008 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

Wir


please do check for improper grounding of the wires...

there seems to be an extra ground for the wire to the starter switch...Please do check the full wiring, with a proper diagram

Best of Luck

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Feb 10, 2008 | Harley Davidson Harley-Davidson Motorcycle...

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