Question about 2000 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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Was riding and my bike it started running like it was running on one cylinder so I changed the spark plugs but now my bike will not idle, It's a 2006 Ultra Classic

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You didn't tell me if your bike was fuel injected or equipped with a carburetor but your problem could be any combination of a lot of things. It could be fuel related with an inoperative injector, a vacuum leak on the intake or around the carburetor, trash in the carburetor, or something as simple as the vacuum hose for the VOES has a leak in it.

It could be a problem with the ignition unit as well. It could be in the "brain box" of the ignition unit or the sensor in the timer cavity. It could be a coil on the verge of total failure or a bad spark plug wire.

With no more information, it would just be a guess as to what your problem might be. The only way to figure it out is to choose a starting point and start checking and eliminating as much as you can. Now. testing some components is not as easy as some think. Take the ignition unit. Harley gives you specific readings you should get when testing the unit but then they tell you that you must use a particular type of meter or you may not get these readings. Just check what you can and if you can't find it, then a trip to the dealer may be the only option.

Good luck

Posted on Nov 07, 2010


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1 Answer

1988 Honda VT800 Shadow only running on one cylinder

Hi, James nice novella you need "FIVE" things in order for a cylinder to run properly:
1. FUEL: in order to validate your not getting fuel spray some starting fluid into the air cleaner and hit the starter button, if it fires up and runs for a few seconds then you know you have a fuel delivery issue. Multi carb banks should be bench "SYNC"
2. SPARK: remove the spark plug and with it connected to the spark plug cable ground the threads to something metal you should see a bluish white spark if not you have a faulty spark plug, spark plug cable, ignition coil, condenser, CKP, ECM, sensor or the wiring in between.
3. COMPRESSION: you must have at least 80-100 PSI for most bikes, multi-cylinder engines should be within 10-15% of each other if not perform a leak down test you may have a burnt or bent valve or hole in the piston or broken rings.
4. CAM TIMING: confirm your timing marks are aligned to see if the cam chain or adjuster are worn out and the chain has skipped a couple teeth.
5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or its counterpart for integrity.
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1 Answer

After changing the spark plugs, and riding the bike for about10 minutes, I heard a back fire , and the bike started smoking, and gasoline leaking throught the tail pipes.

When you drove it for 10 minutes did it work & run perfect without any missing? One cylinder possibly started missing backfired and then maybe the carb flooded some how. I would pull both plugs first. Have a look at the plugs, then you will be able to tell which one was missing (wet with fuel). Check compression on each cylinder and then check the carb. I hope this helps.

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I have a J Deere G 100 Kohler 25 hp mower. On first use this spring, the engine bogs down when the deck is engaged, almost to the point of stalling. New fuel filter, new spark plugs. No change. Help!!

Sounds like you have a dead cylinder. V-twins can run perfectly smooth even one cylinder without a load as they are just running the idle circuits in the carburetor.. Remove spark plug try starting. If it starts shut off engine reconnect plug wire and do the same for the other plug. Should it not start now then that cylinder is dead ignition-wise. Test both cylinders before replacing the coil pack to be sure as it can be a dirty carburetor high speed circuit.

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Sudden loss of power

You seem to have missed the air filter.

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2002 Kawasaki Ninja ZX6R after sitting for a month bike would not start. Got it to start changed spark plugs cleaned Carbs. Bike starts and revs nice. on first gear bike runs great, once in second gear...

Any one of these could be cause of your problem. Sounds like maybe a spark plug coils is bad. Did you gap the plugs? Also sound like secondary fuel injectors not opening fully, and air leaks inbetween intake boots and head. Start bike and let idle Use non-chlorinated brake cleaner spray small squirt on each intake boot find the leak when the bike idles up there is a leak. You can't properly sync multiple carbs if there is even one vacuum or intake leak. Take out spark plugs keep them in their own same cylinders. Read the plugs what do they tell you. Google how to read a spark plug.

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1 Answer

Have a 06 Yamaha 1100 V-star classic, sat for a while before I bought it, front pipe is starting to blue and the idle increases after ya ride it for a couple miles. bike only has 3300 miles on it. could it...


Pipe bluing indicates that cylinder is running lean, therefore too hot. Have you looked at the front spark plug? The insulator should be paper bag tan. Ash white and it's running lean.

The idle going high can be a vacuum leak. You can spray WD-40 (or propane) around the intake flanges when it's running, and if the engine changes speed, you've found the leak.

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My 2009 Kawa Vulan 500 LTD fires on one cylinder

with the bike being new you wouldn't think it's the spark plugs, but you must remember that those are the first plugs that motor has had in it. the plugs are always supposed to be changed at the first service. try changing them and see what happens.

May 10, 2010 | 1995 kawasaki ZX-6R Ninja

1 Answer

Engine starts, runs rough (like cylinder missing), after a minute will run smooth a few seconds, then back to rough idle. new gas, new oil, gas filter seems clear. What else to check?

Establish which is the 'lazy' cylinder (touch the exhaust pipe header with a WET finger). There will be a marked difference in temperature. Change the plug on the 'lazy' side. If no better, check for a good spark - with engine running on the good cylinder, connect the other plug lead to a spare plug and grund the plug body. A weak/internittant spark will be readily apparant.

If there is a spark problem, replace the coil on the dud side. If not, check for equal compresion on both cylinders.

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1 Answer

Rough run

not too sure about this bike i ride a kawi myself, but IF its carburated u might have fuel fould ur plugs try changing them, could have been riding with the choke on. or just as simple as making sure ur idle adjustment is set right,u can usally fix that with a screwdriver and the idle screw check ur manual!!

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New spark plugs last 10-15 minutes of riding

Hi and welcome to FixYa,

Offhand, the only factor to be checked that could foul a sparkplug for your bike would be the 2T oil injector/pump. There is too much 2T oil going to the combustion chamber. Either the injector would require restricting or for some reason, there is also 2T oil in the fuel tank (pre-mix).

Good luck and Thank you for using FixYa. Happy Holidays.

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