Question about 2001 Harley Davidson FLSTF - FLSTFI Fat Boy
I have a 1998 Super glide with 15000 miles on it. ( I bought it used.) When I start it and let it warm up it runs fine. after running out of town at 55mph or so it starts back firing out the pipes. I have cleaned the carb and the coil checked out on the ohms test. I put a test sperk plug on it when it was running ok just to see how much of a aprk it had. Running on one cylinder the coil will jump a one inch gap easy. Some times it quits and after setting a bit it may run a little bit or it may bring me home. (I never know) some times it just cuts out alot and notheing happens and some times it quits all togeather. Its like some one turned off the key but everything still works even the tach. If it aint fuel or spark what can I do?
Hi Rodney, and the usual suspects are:
1. Severely discharged or damaged battery.
2. Loose, corroded or broken battery cable.
3. Alternator not charging or below normal rates.
4. Failed ignition coil, ignition/electronic module.
5. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor.
6. Faulty ignition switch.
7. Water or dirt in fuel system, carburetor or filter.
8. Fuel tank vent system plugged or gas cap not venting.
9. Fuel tank empty.
10. Fuel valve vacuum line broken or carburator vent line closed off.
11. Restricted, blocked or kinked fuel line.
12. Failed fuel pump, pressure regulator and or fuel injectors.
For a prime suspect please visit website below and good luck:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...
Posted on May 27, 2015
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Posted on Jan 02, 2017
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
Since you have thrown the entire ignition system at it, let's think about fuel. If you were running out of gas it would act as you described. I would start by removing the float bowl. Be careful not to spill any gas because we want to look at the level. It should be over half full. Check the float movement. You should be able to push it up without resistance. Looking from the bottom remove the phillips screw that retains the float axle and the float and needle valve should fall out. If the needle valve has three sides or if the rubber tip is worn, replace it. The 3 sided valves have a tendancy to stick closed and all dealer stock should be the 4 sided version by now. After you re-install the float, leave the bowl off and follow the small vacuum hose from the petcock to the carb. Pull it off at the carb end. Look to make sure it isn't damaged. **** lightly (sorry) or use a vacuum pump on the hose. With the petcock on and gas in the tank, a healthy stream of fuel should pour from the needle valve. If not, the petcock diapragm is shot. If none of this helps, take it for a ride and when it acts up, crack the fuel cap loose and if it takes off the vent in the cap is malfunctioning.
Posted on Jan 05, 2009
If it was stored with fuel in the tank:
1. The fuel filter should be replaced
2. You may to replace the fuel delivery system coming out of the tank
3. Remove the plug in the carb and reset the idel mixture
I just bought one store for 6 years - my issue is the bike will n ot idel but runs on the road like a bat out hell.
Posted on May 20, 2009
One more thing to try...loosen the gas cap when it starts misbehaving. If the tank is losing its vent, then it can act that way.
Posted on Jul 22, 2009
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