Question about Harley Davidson FLSTF Fat boy Motorcycles

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98 harley fatboy turns over but wont start

Spark from plugs seems to be inconsistent checked it once and there was spark, checked it again there was not. fires occasionally but wont run. New plugs, new wires, new coil, new fuel filter, new fuel, freshly cleaned carb. Suggestions?

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  • 42 Answers

Some after market ignitions don't spark on the first couple of turns but first take off your air cleaner twist the throttle and look to see if gas is spraying in the carb if not give it a little starting fluid if it fires but then dies then its carb issue. now other thing to check is if you have three posts on your coil then its single fire and your plug wires might be going to the wrong spot switch um around.

Posted on May 18, 2014

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

rselvy
  • 83 Answers

SOURCE: Rear cylinder not firing

The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

Posted on Dec 08, 2008

Benimur
  • 6966 Answers

SOURCE: YZ 450 STARTING PROBLEM

Hi and welcome to FixYa,

Offhand, the backfire is significant. It indicates that fuel is getting inside the combustion chamber and it further confirms that there is spark. Being the case, it would appear that this is now a timing issue. A couple of ideas to explore:

  • compare the original stator coil and the uprated one; are the coil location on the same side, on the same angle, on the same distance from the edge;
  • there would be a guide notch on the base plate of the coils, are they identical and does it fit exactly back into position;
  • there would be a guide/lock pin that keeps the magneto/flywheel in position;
  • there would be timing marks on the magnet/flywheel that must coincide with marks on the engine case.
Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 15, 2008

  • 74 Answers

SOURCE: 1995 honda cbr f3 wont start

I would think about investing in a carb re-build kit.

Posted on Dec 22, 2008

  • 3 Answers

SOURCE: i have 1974 yamaha dt 250 enduro the bike sat

clean contacts on points with sandpaper (800 grit). located behind flywheel, will gurantee a fix. you can remove the side cover and get to contacts through holes in flywheel without removing it.

Posted on Nov 16, 2009

heimlich
  • 1978 Answers

SOURCE: 2000 honda 1100 shadow spirit. Rough idle, little power.

Replace the spark plug caps and try again. On Honda's the cap is often part of the wire (a dealer part) NGK makes some inexpensive plug caps about $5 each. They should OHM out to 5000 anything above or below and you need to replace them. This should fix the problem.

Posted on May 27, 2010

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1995 Harley fatboy has spark getting gas but still wont kick or start.


Hi, Dennis and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enrichner.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to carburetor or throttle body pinched, kinked or blocked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
12. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
13. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
14. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
15. Faulty neutral, clutch lever, or kickstand safety switch.
16. Faulty fuel pump or fuse or relay.
17. A stuck bent or burnt valve.
18. Tilt sensor needs a reset.
19. Security system not disarming alarm needs a reset.
20. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below and for more specific information or questions at no charge please feel free to contact me at xlch@mail.com. Good luck and have a nice day.
Fatboy Won Start Please help Harley Davidson Forums
http://www.carlsalter.com/pdfs/Harley%20Davidson-HD%201984-1998%20FLH-FLHT-FXR-FXSB-FXEF%20Service%20Manual.pdf
http://partsfinder.onlinemicrofiche.com/ronnies/showmodel.asp?make=hdmc
http://www.harley-davidson.com/content/h-d/en_US/home/owners/maintain-your-bike/owners-manual.html
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Jan 16, 2017 | Harley Davidson Motorcycles

1 Answer

2008 fatboy


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

Sep 19, 2008 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

Which plug wire from coil goes to cy on 98 fatboy 80"


High Anonymous, the bottom spark plug tower goes to the rear cylinder, the top spark plug tower goes to the front cylinder. Good luck

Feb 02, 2014 | 1993 Harley Davidson FLSTF Fat boy

1 Answer

1993 HD fatboy won't start. has spark and fuel and turns over


Hi Leon, and the usual suspects are:
1. Fuel tank empty
2. Fuel supply valve turned off.
3. Fouled spark plugs.
4. Engine flooded with gasoline as a result of over use of enrichner.
5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections.
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
11. Engine lubricant to heavy ( winter operation )
12. Sticking or damaged valves or push rod wrong length.
13. Primary cam sproket spline sheared or missing spacer.
14. Security alarm system not disarming.
Good luck

Jan 05, 2013 | Harley Davidson FLSTF Fat boy Motorcycles

1 Answer

I have a 2000 Harley fatboy and it won't start


Hi Tim, when checking for spark the CKP needs to measure the compression bump in order to send the correct signal to the ICM/ECM so always check for spark with either a third plug grounded or lift the end of the plug boot 1/2 " off one of spark plugs that are in the head. and the usual suspects are:
1. Fuel tank empty
2. Fuel supply valve turned off.
3. Fouled spark plugs.
4. Engine flooded with gasoline as a result of over use of enrichner.
5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections.
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
11. Engine lubricant to heavy ( winter operation )
12. Sticking or damaged valves or push rod wrong length.
13. Primary cam sproket spline sheared or missing spacer.
14. Security alarm system not disarming.
For a primary suspect please visit the website below: Good luck
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Mar 18, 2012 | Harley Davidson FLSTF Fat boy Motorcycles

1 Answer

I have a 1998 fatboy and turns over fine but no start how can i rule out the coil or see if it is the ignition module


On the 98 Evo motor, take the spark plugs out of the heads and then reinsert them into the spark plug wires. Lay the plugs on the head and turn the engine over with the starter. You should see the spark plugs firing.

Good Luck
Steve

Mar 26, 2011 | Harley Davidson FLSTF Fat boy Motorcycles

1 Answer

Hi we have just received our harley 98 anniversary fatboy from US. It wouldnt start so we have purchased a new battery. Now we can hear the engine ticking over but it isnt actually starting - any...


You didn't tell me what kind of carburator you have. At any rate, it should have an enricher (choke) on the carb. Put it out or up (depending on type of carb), Twist the throttle grip twice to give the carb a couple of squirts of fuel, then press the start button while leaving the throttle completely closed. It should start. If you crack the throttle open the least little bit, you render the enricher circuit useless. Leave the throttle closed

good Luck
Steve

Oct 27, 2010 | Harley Davidson FLSTF - FLSTFI Fat Boy...

1 Answer

1999 Fatboy backfiring & no spark


The guy with the same problem..Your leaving your enrichner (choke) out thats where the 2000rpm and soot comes from...Original fellow I think you may have an intake leak around your manifold or carb.

Apr 21, 2009 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

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...

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