Question about 2000 Harley Davidson FXDWG Dyna Wide Glide

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At about 70 mph my bike feels like its struggling to run then it will lightly backfire through the carb. Ive already changed the voes on the intake.

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Posted on Jul 18, 2009

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Backfires at idle (sometimes) but seems through air intake not exhaust ? Bike struggles to start without choke when warm ??


A bike that backfires through the carb has ignition timing that is too far advanced. This will also cause bad starting. Get the timing fixed.

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2003 harley 1200 custom sportster with 50 miles strats up fine with choke pulled out. once engine is warm and choke is pushed in 50% bike stalls out. have repalaced gas, spark plugs and just took apart...


A 2003 model with only 50 miles?? Wow....well,since youve already taken the carb apart and cleaned it,did you hook up the vaccum line for the VOES switch on the intake manifold? If so,..when you get the bike running,..spray some brake clean around the intake where it bolts to the heads.If the idle picks up,or starts to sputter,..youve got leaking intake gaskets. Which is a good possibility on a bike that old with that few miles on it.The choke essentailly adds more fuel to the motor,and by what your saying,the bike is obviously running lean. Also,...im ASSUMING that you have fresh gas in it,and the petcock is turned on.

Sep 25, 2012 | 2003 Harley Davidson XL 1200 C Sportster...

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Poor running ducati 900ss


Did you clean out your idle and main jets? If you did already you might have a intake air leak..

May 01, 2012 | 1993 Ducati Monster 900

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Hi i have a poineer 125 scooter. the problem is when at top speed the bike draws bk and spluters it feels to slow iv changed the spark plug.the bike used to do 65 even 70 mph but now it struggles to do 50....


You say that it did 70 after the belt was changed, this seems to indicate that the belt could be slipping. Either replace the belt again or get hold of some belt dressing which makes the belt grip better in the pulleys. Another thing to look for is a blocked exhaust port and muffler box plus look at your air filter to see if it is not perhaps restricting inlet air flow.

Jun 08, 2011 | Qingqi Trikes Mustang ST1 Motorcycles

1 Answer

Had a 1200 upgrade, new exhaust valves, guides seals, have a stage 1 arlen ness filter, 2 1/2 " 45 calaber drags, had a 45 slow jet, the shop put in a 170 main jet, ran fine for a while then the plugs...


I would say that something has changed since you had the work done. You said that it ran good and got 54 mpg (you said "mph" but I think you meant MPG") after the work was done. Now, it's backfireing, sputtering, and getting 37 mpg with dry black deposits on the plugs. Something has changed.

Considering that you didn't mention anything you changed, the only thing that has changed is the weather, it has turned cold. Cold air is more dense than hot air therefore, your carb should be running leaner, not richer. But, I'd be willing to bet that you're allowing your bike to run longer with the enricher on when warming it up before a ride. Am I right?

The enricher circuit is a very rich mixture. It's rich enough that if you allow your engine to run too long with the enricher on, it will foul your plugs. Fouled plugs are indicated by a black sooty deposit on them. In my experience, once a Sportster fouls a plug, it will not clean itself like a Big Twin will. Why this is I have no idea but that's my experience. You'll either have to replace the plugs or get them cleaned somewhere. I clean them in a glass beading machine but you have to blow them out very well before reinstalling them. I also put a little anti-seize on the threads to keep from damaging the spark plug hole threads.

Try installing a new set of plugs and when you start your bike, only run the enricher long enough to warm the bike to the point where you can keep it running with the throttle lock knob to bring the engine to operating temperature. That enricher is a plug killer.

The only other thing I can figure is that the main jet has come loose and fallen out, trash in the needle and seat, a vacuum leak on the front head at the intake manifold, the VOES, or petcock. If it ran good in warm weather with the 170 main, it should run good or may a tad lean in cold weather.

Dec 29, 2009 | 2005 Harley Davidson XL 1200 C Sportster...

1 Answer

Bach firing wont start could be coil wireing or new ss carb setting


On the carb, turn the idle mixture screw all the way in and then back it out one turn. It should start there. The jetting should be something close to a 29.5 slow speed jet and a 70 or 72 high speed jet. Make sure you don't have any vacuum leaks on the engine or carb. Check to see if there is a vacuum port for the VOES that you've left open. If the bike was running before, simply changing the carb should not cause it not to crank.

Nov 27, 2009 | Harley Davidson FLHT Electra Glide...

1 Answer

Finding a 1983 harley carb with VOES tube


The original carb on a 1983 XLH was a Kehien "butterfly" type carb as opposed to the current Kehien "CV" type carb. You can find a replacement carb but you're going to look real hard for it and when you find it, it may have the same problem your carb had. So, there are a few things you can do to get around the problem.

One, you can purchase an aftermarket carb and manifold such as an S&S. The S&S Super "E" Shorty card is a good carb but it is a bit big for the 1000cc engine. If you jet it correctly and run an exhaust system with a little backpressure, it will perform well. It will also come with a nipple for your VOES switch.

Two, you can purchase an intake manifold (S&S) or modify your original manifold to provide the vacuum for your VOES. To modify your own manifold, you simply need a piece of brass tubing or a nipple that you can drill the appropiated size hole in the intake and install the nipple. If you have your old carb, measure the nipple and make one yourself. It doesn't have to be made of brass. Drill a hole in the appropiate size bolt and drill and tap your intake for the bolt to screw into it. Don't screw it in too far though and I'd install it in the flange that the carb bolts too.

Three, you can run your bike without the VOES switch. You will need to check the advanced timing on your engine. Set your ignition advanced timing to the mark on the flywheel that represents the "Front Cylinder Advanced" timing mark. This will allow your maximum advanced timing to go to the 35° maximum but no further.

There is a lot of discussion about the operation of the VOES. Depends on what you think it does, advance the timing or ****** the timing. It actually does both. Under light load conditions (high manifold vacuum) the VOES allows your ignition control unit to actually advance the maximum timing on your engine. Sometimes under these light load conditions, your engine may be running at 40° BTDC timing. But, when you open the throttle and put a load on the engine (manifold vacuum goes low) the switch tells your ignition control unit to go back to 'normal" ignition timing of 35° maximum. The purpose of doing this is two-fold. One, it gives you better fuel economy and, two, it prevents detonation or "spark knock". If you disable the VOES by disconnecting it's vacuum source and setting the maximum ignition timing to the "front cylinder advanced" mark (35°BTDC), your bike will run fine but your fuel economy may suffer slightly.

Nov 08, 2009 | Harley Davidson XLH 1000 Sportster...

1 Answer

It is backfiring and when it idles it will cut off


sounds like a air leak to me , spray some wd40 gt85 etc on the manifold ( where the carb goes to the cylinders if the bike revs up high or struggles really bad then dies out you will need to replace the intake seals , easy job to do and the seals only cost a couple of quid while your in there changing the seals it would also be a ideal time to make sure your mixture settings are correct on the carb .
hope this is helpfull to you, any other questions just ask
kind regards
bert31000

Mar 18, 2009 | 2005 Buell Blast

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