Question about Harley Davidson XLH 1000 Sportster Motorcycles

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It runs but its running rough as long as u get in it slow it gos u give it throotle it breaks up bad and plugs get real black its fouled out 2 sets of plugs trying o get it to run decent got new plugs points and checked advance on it

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Bad Gas? Plugged Carbs overhaul Carbs adjust air/fuel mixture?

Posted on Sep 06, 2010

  • DillyWackSac
    DillyWackSac Sep 06, 2010

    Fuel pump if it has one? Unplug gas hose going to carb and try starting- remove any and all spark to prevent a fire try starting if has a fuel pump see if fuel comes out. If you do not have a fuel pump the still remove hose at carb and check for fuel flow if not flow then petcock may be suspect..Replace..

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Posted on Jan 02, 2017

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Blowing black smoke


far too much fuel not getting completely burned upon iginition.
That leads on to look at:
-fouled fuel injectors, (clean them - run injector cleaner)
-lack of air to the intake (filter and clear out tubing),
-spark plugs are fouled, (replace them, ensure wires seated correctly on plug)
-ignition power is low or partial, (ignition system module not sending enough electricity to plugs)
-ignition wires are bad, (check/replace)
-ECM is failing or getting bad sensor readings. (shop diagnosis)
-cat convertors have been removed and sensors are at fault
Its a long list -- do the easy stuff yourself, leave hard stuff to a shop diagnosis.

Mar 28, 2015 | Cars & Trucks

1 Answer

What makes the DFI light come on but the engine still runs but seems to run slow


More than likely you have either a bad coil or the rocker arm has slipped off. Pull each plug, Check plug. If 1 is fouled, that cylinder is where the problem is. Check for spark on each cylinder, If one has no spark, replace the coil (there are 2). Replace only the bad one. Before replacing the coil, check for compression, if on is real low, pull off the rocker cover and check for valve action.

Jan 30, 2015 | kawasaki 2011 Mule 4010 4x4

2 Answers

Check engine light/ battery light / check gages light all came on at the same time.


Have the alternator and battery tested this many warning lights come on most often due to low battery voltage due to a faulty alternator.

Apr 30, 2017 | 1993 Plymouth Voyager

1 Answer

Black smoke from exhaust, rough idle, black soot on plugs


signs of a bad fuel pressure regulator-- the vehicle will run rough, the engine will not start ( usually in the mornings,) many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. replacement is only cure. 1- black soot on plugs-2-black smoke from tailpipe-3- running rough-4- stalling, good-day! repost if need be.

Aug 10, 2011 | 1994 Suzuki Sidekick

2 Answers

Bike runs great. until it warms up then it backfires and spits and sputters


It sounds like a fuel problem. Next time it starts doing this, take the air filter cover and the air filter off. Leave the air filter backing plate on the engine and go for a ride. If it runs better, the carb is too rich. If it runs worse, the carb is too lean. They are usually jetted very lean from the factory to meet EPA standards.

If the bike is fuel injected, the dealer will have to change that as it's not owner servicable.

If you run it too long with the enricher on when it's cold, it will foul the spark plugs. The enricher is way rich. I usually only run the enricher long enough to get the warm enough to run while holding the throttle open or using the throttle lock. Don't run the enricher any longer than necessary. Put in a new set of plugs that try that. Big Twins are bad about the enricher fouling the plugs, Sportsters are the king of fouled plugs when using the enricher. When you purchase spark plugs, just buy the Autolite 4164 plugs. They run as well as anything out there and don't cost nearly as much.

Good Luck
Steve

Aug 23, 2010 | 2005 Harley Davidson XL 1200 C Sportster...

2 Answers

Generator ran fine Friday evening but when I cranked it Saturday evening it ran from 10:00pm to around 2:00am then quit. I woke up to a cold camper. I was able to re crank the generator but it runs real...


If plug is fouled, that would explain running rought and some smoking. But for something to happen all of a sudden, I would suspect bad fuel, which can cause fouled plugs.

Dec 15, 2009 | Electrical Supplies

1 Answer

18 HP Briggs and Stratton OHV Model 31M777 runs rough


Have you checked the choke? Sounds like it might be stuck closed or partly closed.

Jun 20, 2009 | Garden

3 Answers

Honda Valkyrie runs rough


Your carburetors have varnished fuel in them and need cleaning. You most likely have clogged slow and fast jets. The fouled plugs pretty much say it all with this regard.

Mar 23, 2009 | 1997 Honda F6 C Valkyrie

1 Answer

Sometime works other 50/50 won't idle


Honestly, I would say its your Mass airflow sensor. Sounds like your truck is sucking either not enough, or too much for the air/fuel mixture to compensate. Thats what it sounds like to me. I would replace that, or even clean it. If you take it out, and clean it up real good with some alcohol, you might catch a break as well. Hope all goes well.

Mar 15, 2009 | 1997 Dodge Ram 1500 Club Cab

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