Question about Harley Davidson Motorcycles

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1996 road king idles. when i start to ride it backfires and stalls

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  • Master
  • 1,727 Answers

In this order : check for spark at both cylinders. check for proper fuel flow into carb, then check carb itself for gummed up, dirty jets. after that I;ll need more info

Posted on Nov 27, 2013

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 29 Answers

SOURCE: 1983 FLHS starts and idles fine,pops and backfires when riding

In 1983 the carb used on this model was a kehin. They can be made to work well, with a couple of tweaks. First, on the top about midway, you will see a boss sticking straight up. Unless it has already been done, use a jabsaw and cut the top 1/8 inch off the top. Using a tiny improvised screwdriver, back out the idle adjustment screw which is down inside about a half a turn. Then remove the float bowl. You will see 2 tubes hanging down. Remove the rubber plug from the larger one and remove the low speed jet. The jet and the mixture screw are soft brass, so make sure you don't shred them. The jet has a number stamped on the end. Go to a knowlegble shop and get the next size up. For example if you have a 52 and they say the next size is a 54, that's what you want. Take the old jet with you and compair the size of the air holes along the side. They should be the same size. If not, they are selling you a jet for a cv carb and that will not work. (common mistake) Don't forget to shove that rubber plug back when you reassemble it. If I have your problem pegged correctly, the bike will be less cold blooded and the driveability will be much better.

Posted on Jan 06, 2009

joecoolvette
  • 5660 Answers

SOURCE: when riding 2005 fuel injected harley road king,

Sounds like the intake manifold is leaking. The area where the leak usually happens, are those two rubber sleeves that go from the heads, (Cylinder heads) to the intake. Sometimes the clamp/s loosen up. Sometimes these rubber sleeves deteriorate, and cracks form.

This makes the engine backfire, pop, and idle fast.

The added air at the wrong time cause a backfire, when you let off the throttle. The added air causes the engine to pop, because the exhaust valve has sucked up some cold air.
The engine idles fast, because more air is being introduced, and not metered by the injection system.

(The exhaust valve thing. Exhaust valves are supposed to open, and let exhaust out right? Well there is a thing called Valve Overlap.
The Exhaust valve hasn't closed all the way yet, and the Intake valve is opening.
The 4 stroke engine, (Of which a Harley is), has these four strokes.
1.Intake Stroke. Fuel/air is sucked in.
2.Compression Stroke. The piston comes up and squeezes the fuel/air mixture.
3.Combustion Stroke. The spark plug lights the fuel/air mixture off.
4.Exhaust Stroke. The spent gases are expelled out.

Your Road King has one camshaft. There are four cam lobes on it.
Intake, Exhaust, Intake, Exhaust.

If you had the camshaft in your hand, and had the gear end facing you, look down the camshaft. You will see those egg shaped cam lobes. You will notice that No.1 cylinder Intake lobe is facing to the left.
No.1 Exhaust is facing to the right.

If you put a degree wheel on the gear end of the camshaft, and had the No.1 Exhaust lobe ramp nose facing straight up, you would see that it's about 110 degrees, before the Intake lobe ramp at .050 lift, comes into play. (The roller, of your roller lifter has raised the Exhaust valve up .050 inch) There is about 55 degrees before the Exhaust valve hasn't quite shut.
This is okay for normal running. Introduce a vacuum leak, and the surge of extra cold air, makes it pop.

Solution? I suggest checking to see if the clamps on those rubber sleeves are loose. You can also spray WD-40 towards the ends of each rubber sleeve, when the engine is idling, and see if it speeds up. Means, one or more, of those rubber sleeves has deteriorated.

Posted on Apr 25, 2009

ldaala
  • 65 Answers

SOURCE: Stalling and backfireing

to me it sounds like it might need some spark plugs put in

Posted on May 29, 2009

wd4ity
  • 4565 Answers

SOURCE: 2003 HD Road King -

If you bike is equipped with a carburetor, the idle stop screw is located at the top of the carb on the right side. Counterclockwise turn slows the idle speed.

If you bike is fuel injected, a dealer or shop will have to set the idle speed electronically.

Good Luck
Steve

Posted on Sep 17, 2010

wd4ity
  • 4565 Answers

SOURCE: 2002 road king classic keeps

If your bike is fuel injected, there is nothing you can do. You must take it to a shop and let them set the idle speed. If it's equipped with a carb, remove the air cleaner cover and look at the square top on the carb. Just to the right of that cover is a screw, the throttle stop screw. Turn this screw clockwise to increase the idle speed. It should idle at about 1000 RPM.

Good Luck
Steve

Posted on Apr 07, 2011

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1 Answer

What causes a 2002 harley road king with fuel injection to backfire at idle?


Looks like a leak at intake manifold. Start the engine ,spray a Carb cleaner on the manifold close to the Cylinder's and if you hear a change on idle ,then you have an intake leak.....

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2 Answers

1996 road king stalling while riding


Possible Intake boots leaking causing a mistfire and running lean. Make sure you run the harley plugs. Is there a power commander on it ? If you do they are known to go bad and mess up runablilty.
This may be a long shot but since you have the magnelli marelli fuel injection system , you might need a hot/cold idle adjustments and clean out the inside of the throttle body.

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2001 Fuel Injected Road King Hiccups and backfires under 2500 rpm cuts out at idle


Hi Anonymous, please be aware that this question has already been asked and answered. Thank you

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1 Answer

When riding a 2005 road king custom with a 95 cubic inch engine. The engine starts to stall or hesitates. Why is this?


if it happens when the bike gets hot it is your crank position sensor it is located by your oil filter

Sep 19, 2011 | 2006 Harley Davidson FLHR Road king

1 Answer

2002 road king classic keeps stalling when i come to a stop and there is some backfire as well . when i first start up the bike it will idle .


If your bike is fuel injected, there is nothing you can do. You must take it to a shop and let them set the idle speed. If it's equipped with a carb, remove the air cleaner cover and look at the square top on the carb. Just to the right of that cover is a screw, the throttle stop screw. Turn this screw clockwise to increase the idle speed. It should idle at about 1000 RPM.

Good Luck
Steve

Apr 07, 2011 | 2002 Harley Davidson FLHRCI Road King...

1 Answer

2003 HD Road King - starts fine, idle normal. Once it is warm, idles at 2000 rpm. Does not come back down, even after riding for an hour or two. Only idles normal when cold. Help??


If you bike is equipped with a carburetor, the idle stop screw is located at the top of the carb on the right side. Counterclockwise turn slows the idle speed.

If you bike is fuel injected, a dealer or shop will have to set the idle speed electronically.

Good Luck
Steve

Sep 16, 2010 | 2003 Harley Davidson FLHRCI Road King...

1 Answer

Stalling and backfireing


to me it sounds like it might need some spark plugs put in

May 29, 2009 | 2000 Harley Davidson FLHRCI Road King...

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