Question about 2000 Harley Davidson FLHR-FLHRI Road king

3 Answers

What size spark plug for a 2000 harley davidson road king carbed,

It is carbed and seems to be running lean, popping when downshiftingr

Posted by on

  • 1 more comment 
  • rcbrewer10 Feb 15, 2009

    I use premium, its running a bit lean, don't think I want a hotter plug. thanks for the imput though

  • Anonymous Mar 18, 2014

    My 03 road king classic back fires and carb pops?? How can I fix this??

  • Anonymous Mar 29, 2014

    replaceing cams on 99 rk upgraded to 95 inch w cncd ported heads macuni 42 carb look for a cam w lowend tq for pulling trailer

×

3 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 150 Answers

Your Twin Cam plug should be a 6R 12 Harley Plug. Often times the back fire is just the nature of the beast depending on what type of pipes you are running. Harleys do run lean, its an EPA thing thtas why they choke them down from the factory. Since you have a carb you could have an intake leak around the Intake. Also Under the carb is an adjustment screw. Harley plugs it up so people don't play with it. You have to just drill out the plug this will set your air fuel. Whenever I take a carb off I drill out that plug. Heat your bike up operating temp and ear tune that screw. Only other way is with air fuel analizer or a dyno. good luck.also that backfire is caused by fuel hitting your exhaust when you let off just to let you know.

Posted on Jun 15, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 104 Answers

FIRST THING A MECHANIC WILL LOOK AT IS WHAT FUEL YOU ARE RUNNING THROUGH THE BIKE PREMIUM FUEL IS ALLWAYS BEST BECAUSE A CARBED UP PLUG EITHER SUGESTS FUEL OR POSSIBLY ELECTRICAL GET THE BEST FUEL AND CHANGE TO A HOTTER RUNNING PLUG

Posted on Feb 15, 2009

  • charles lill Feb 15, 2009

    OK RUNNING LEAN THATS TOO MUCH AIR GETTING THROUGH TO THE CARB HAVE YOU CLEANED THE FILTER LATELY WANT TO TRY SOAKING IN A LIGHT OIL POPPING THOUGH IS MISFIRE IE ELECTRICAL OR FUEL RATING

×

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

  • Harley Davidson Expert
  • 291 Answers

Popping/backfiring on decelerating is mostly caused by an exaust leak at the manifold where fresh air is entering the hot exaust and igniting unburnt fuel. Short straight through pipes are prone to this and nothing will cure it. If spark plug colour is light tan or grey (not bone white or blistered) then the mixture is more than likely o/k.

Posted on Feb 27, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2004 flhycui harley pops when shifting and pops when down shifting


The idle might be a little lean.
If it's a carb (your model year offered both carb OR fuel injection), richen up the idle mixture screw a touch and see if that helps.

If not, check for an air leak at intake manifold, both where the carb attaches to manifold, and where manifold attaches to cylinder head.
An air leak will lean out the mixture.

Jan 12, 2014 | 2005 Harley Davidson FLHRS - FLHRSI Road...

1 Answer

NOT GETTING A SPARK ON MY HARLEY ROAD KING


Hi Anonymous, on twin cams make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in head. If still not getting spark the usual suspects are:
1. Fouled spark plugs.
2. Battery voltage below 8.7 volts, loose or broken battery cables especially ground cable to frame.
3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, MAP or BAS sensor.
7. Faulty ignition switch.
For a possible prime suspect please visit the website below and good luck.
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Jan 04, 2014 | 2000 Harley Davidson FLHRCI Road King...

1 Answer

Spark plug gap 2000 road king


Hi Anonymous, the HD 6R12 spark plug is gapped at .040" Have nice day.

Aug 02, 2012 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

2000 ROAD KING TROUBLE CODE 85EE


Hi Joe, for more information about your question please visit the websites below. Good luck and have nice day.
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Jun 01, 2012 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

2000 harley road king will not start,new battery,drained and refill fuel tank,engine light comes on for 4 seconds and hear fuel pump run, cranks over good but no start,has not run for 2 years.


Hi, i would work from here. Check the spark plugs, the plug wires, and the coil. Those hardly go bad, so it's possible that something is not allowing the coil to fire.

May 07, 2011 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

I have 2003 roadking ,it has 15204 miles and it will not start. i checked the spark plugs and there is spark ,put not wet with gas. used starting fluid and it did start for 5 sec. had the carb rebuilt in...


If it started with starting fluid, it sounds like a fuel delivery problem.
start from the tank and work your way down.
check pet ****, fuel filter, and carb.

Oct 12, 2010 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

Warning code


Hi Jbird91, for more information about your question please visit the websites below. Good luck and have nice day.
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Jul 10, 2010 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

Harley davidson road king 2000 flhr new battery fitted,new spark plugs. bike will crank over but will not start


Don't ding me on this response, (it's happened to me) is the run switch turned off, it's the first switch on the right handlebar.
I'm assuming it was running prior to doing your maintenance.

May 31, 2010 | 2002 Harley Davidson FLHR - FLHRCI Road...

1 Answer

2002 FLHTCI MISSING AT TIMES


It sounds like the engine is running a bit lean but it could be spark plugs or wires breaking down under a load. Try another set of spark plugs but don't throw the old ones away. If this does not correct the problem, you're going to have to take the bike to a dealer or someone that can "remap" the fuel system. The mechanic may want to see the old spark plugs to determine if the mixture is lean. Due to EPA emission standards requirements, Harley's come set up to run very lean and sometimes they are just too lean for some areas of the country. Good Luck.

Apr 16, 2010 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

My 2000 Road King classic starts hard, pops on excelleration. I live at 9000 feet in Colorado and it seems worse at lower elevations. Any idea what the problem is?


Sounds like the carbs are all messed up either too lean, does it run hot? or too rich is your mileage crappy and does it love to rev? get it mixture changed accordingly or have it re-jetted

Jun 26, 2009 | 2000 Harley Davidson FLHR-FLHRI Road king

Not finding what you are looking for?
2000 Harley Davidson FLHR-FLHRI Road king Logo

773 people viewed this question

Ask a Question

Usually answered in minutes!

Top Harley Davidson Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4477 Answers

Gills Lango

Level 2 Expert

195 Answers

Mike

Level 3 Expert

4331 Answers

Are you a Harley Davidson Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...