Question about 2000 Harley Davidson XL 1200 C Sportster Custom

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2005 sportster (1200) need to lean-out air fuel ratio.fuel fouling plugs,with clean air filter element.

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  • jason goddard May 11, 2010

    have you changed any internals int he motor. Have you changed exhaust. May need to have card rejetted. What are you running for a carb?

  • hardan May 11, 2010

    What do you have for airbox and exhaust? What size jets are you running? Has there been any carb work done?


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  • Harley Davidson Master
  • 40,627 Answers

Hi Lance_daddow, take a ride over to your local dealers service department, I'm sure they will be happy to take your Harley Davidson for a test ride if necessary and offer professional advice and assistance concerning your issue. Have a nice day.

Posted on Jun 02, 2015

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SOURCE: 2005 harley davidson 1200 custom sportster; security system

Put a new battery in the fob.....they are only good for about a two years usually.

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SOURCE: How do I change trans fluid on a 2005 1200

The sporster shares fluid with the primary and tranny. There is a drain plug basicly behind the kickstand. It takes 1 quart of gear lube, I use Mobile 1 90 weight.

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SOURCE: how to change brake pads on a 2005 1200 Harley

there is 2 bolts on the caliper take them off and there are pad pins that need to be taken out.. inside the caliper there is a metal clip where the pad sits in.. put them in the same way they came out once you start its pretty self explainatory.. you should not have to blead them

Posted on Aug 30, 2009

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1 Answer

I keep fouling plugs on my 2005 vstar 1100 classic tried going a step hotter but they still foul after a very short time? exhaust is open was that way when I bought it

Just a thought. is your air filter clean? A dirty filter will make it burn more fuel and cause the plugs to foul.Is your choke working properly? Both of these will foul plugs and use more fuel.

Aug 16, 2016 | 2005 Yamaha V Star 1100 Classic

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Codes too lean, stalls when warm. replaced o2,MAF,filter, plugs and coils

Check for air leaks with a water spray from an old spray bottle. Run the engine and spray around gasket seams and Vacuum lines.

Lean code means too much air, not too little fuel. Engine is dumping fuel to get correct fuel ratio.

Mar 22, 2014 | 2005 Lincoln Aviator

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1999 Ford Truck Explorer 2WD 4.0L SOHC 6cyl is detecting rich or lean air fuel ratio what could it be

try spray cleaning your air mass sensor. be careful and use very little spray. you can damage the air mass sensor with too much spray. the air mass senser tells the computer if your air filter needs to be replaced. it is located between the air filter and the air throttle body.

Dec 03, 2012 | 1999 Ford Explorer

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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

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

2 Answers


Lean running condition A lean running condition means that the air/fuel mixture is unbalanced, and that the engine is getting either too much air, not enough fuel, or a combination of both. Optimally, this ratio should be around 14.7 parts air to 1 part fuel by mass, at low or cruising loads. This ratio is known as stoichiometric for gasoline. Ideally, at WOT, you should aim between 11.5:1 (Rich best torque at WOT) and 13.3:1 (Lean best torque at WOT).
Running lean, like having your spark timing too advanced, creates much more heat during the combustion process. This can lead to piston seizure, a hole in the piston, melted spark plug electrode or other complications due to overheating. You will not be producing peak power, and your exhaust will also emit more oxides of nitrogen, arguably one of the worst byproducts of gasoline combustion for our environment.
Common causes of a lean running condition are an improperly tuned carburetor, clogged fuel line, clogged fuel filter, or a vacuum leak.
Preforming a plug chop is a good way to find out if your engine is running too lean, as you will see a powdery white residue on your spark plug in the presence of a lean condition.
On the other end of the spectrum, richer ratios will also cause lost power, however this will most likely be accompanied by black smoke (around the 9:1 fuel/air ratio area), and fouled spark plugs.

May 30, 2010 | 2002 Saturn VUE

1 Answer

Overheats won't re-start til cools off.

Your Sportster is an air cooled engine. If it's overheating, you got some serious problems.

First, check your oil level and make sure you've got plenty of oil in the bike. With the engine running and on the side stand, pull the oil fill plug and look into the tank. Shine a flashlight in there and make sure your oil is flowing. You should see the oil flowing back into the tank.

If that's alright, your carburator or fuel injection is running too lean. A too lean mixture will cause the engine spit back through the intake and run too hot.

If it's a carburated bike, you need to go up on step on the slow speed jet and raise the needle about 0.020" to richen the low speed and mid-range mixture. You may even need to richen the main jet up one step.

If the bike is fuel injected, you need to take it to a dealer and have them make the adjustments on the fuel system. The fuel to air ratio should be no higher than 14 to 1, preferrably 13.5:1. Anyone with a exhaust gas analyzer can check this for you. A dyno tune would be a good investment.

Good Luck

May 09, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

Cannot keep it running, just backfires

fuel system needs cleaning, air filter and exhaust must be in place as well.(clean,no leaks) make sure plug wires are in good condition,and srark plugs are clean

Apr 16, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

1 Answer

2005 1200 sportster bogs when idling

It could be any number of things but I would tend to think that it's something to do with the carburetor. It could be something as simple as it's idled too low. The idle speed should be about a thousand RPMs or so.

Your bike also came from the factory jetted extremely lean. A "jet kit' may help the problem in that it will richen the mixture up just a bit making the transition from the idle circuit to the midrange circuit smoother.

Next, you may have a problem with the accelerator pump on your carb. If the pump is not working correctly. Remove the air filter cover and element so that you can see into the carb. With the engine NOT running, crank the throttle to wide open position while looking into the carb. You should see a stream of fuel being squirted into the carb out of a brass nozzle in the throat of the carb. If you don't see this, you need to have the carb serviced.

Apr 14, 2010 | 2000 Harley Davidson XL 1200 S Sportster...

1 Answer

I have a 03 Harley XL Custom Sportster that has a hard time starting both cold and after 4 or so minutes after sitting. Have aftermarket exhaust, K&N air filter. Has new spark plugs. It also pops in...

You are experiencing a lean condition (to much air vs fuel) due to your exhaust and k & n filter modifications. This means you'll have to re-jet you carb so more fuel is introduced so proper ignition can take place. Running lean will result in detonation and big dollar repairs. If you have fuel injection you will have to purchase a fuel/ignition management module i.e. power commander, sreaming eagle race tuner or the like so you can upload the correct air/fuel mixtures as per your mods.

Apr 02, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

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