Question about 2007 Harley Davidson FLHRC Road King Classic

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I have a 2007 Harley Davison Rd., King I have a problem trying to start the bike after it is warmed up it sounds like it is backfiring

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  • Harley Davidson Master
  • 3,506 Answers

Try new plugs first Are there any DTCs set

Posted on Oct 18, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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

v2iper
  • 150 Answers

SOURCE: 1999 road king wont start

Its your fuel pump if you can't hear it. And its inside your tank. Not a hard fix if you have a book that tells you how to remove it. Alot of procedures to follow to get it right. And yes it does work off a relay.

Posted on Jun 14, 2009

  • 202 Answers

SOURCE: Bike is backfiring through carb.

do u have the correct spark plug the one recommended by the manufacturer

Posted on Aug 02, 2009

wd4ity
  • 4565 Answers

SOURCE: when does a speedometer stop on harley davison

Since the speeometer is electronic and gets it's "pulses" from the transmission, it stops whenever the transmission stops turning inside. Now, if one got into a situation in which he applied the rear brake hard enough to lock the rear wheel thereby causing the engine to stall, the speeometer would stop at that moment even if the bike didn't. This is my opinion.

Posted on Sep 25, 2009

  • 1 Answer

SOURCE: harman kardon audio system for harley davison not calibrated

i have the harmon kardon stereo for harley and the sound keeps going out on it. This is the fourth unit that the same thing has happened too. Its like the unit goes into mute mode but its not. everything works but the sound. can u help me please.

Posted on Mar 03, 2010

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When trying to start the bike when it's cool it cranks for a while before it starts and sometimes it backfires through the air cleaner but when it's warm it starts right away. Tried spraying brake...


check the float, Harleys are know for sticking floats when warm, the backfire is caused by the float allowing fuel to dribble down and semi flooding it, when the fire hits the cylinder, it backfires due to too much fuel,

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Spitting and light backfiring in air filter


Is the bike fully warm if so ya may have an intake leak. Check this by spraying starting fluid on the intake manifold where it bolts to the heads with the engine running and fully warm. If the RPMs either increase or decrease then you have an intake leak. It could also be that the bike is just running to lean(getting to much air) If it is a fuel injected model Id suggest taking it to a dealership and having them do the work. Carburated model you can simply put a bigger slow jet in it and adjust the fuel mixture from there. Good luck and thansk for using Fixya.com

May 19, 2010 | 2006 Harley Davidson FLHR Road king

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