Question about 2003 Harley Davidson FLHRCI Road King Classic

1 Answer

I wanted to know when to change spark plugs on my 2003 FLHR.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 216 Answers

Inspect them every 5000 miles and replace them every 10,000 miles....this is the recommended service interval....

Posted on Mar 11, 2009

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

03 H-D RK, will not start after short storage, gas is fresh,new plugs,fuel pump is working .

Hi Anonymous, remove a spark plug cable leaving both plugs in head, and insert a spare spark plug ground the threads and test for spark. Also try squirting starting fluid into the induction module to see if it's fuel related. That being said you might have upset the ECM when you replaced the battery, refusing to play with the other children and need to do a reset. Please visit the websites below as they may help assist you in resolving this issue:

Harley Trouble Codes
Good luck

Apr 05, 2014 | 2003 Harley Davidson FLHR Road king

1 Answer

Changing spark plug wires on 2002 harley davidson flhr

Hi Anonymous, I need more information please tell me the year and model of your bike and exactly what your question is and can you be specific and include details like WHERE, WHEN , WHY, WHICH ONE, HOW? Thank you and have nice day.

May 01, 2013 | 2002 Harley Davidson FLHR - FLHRCI Road...

1 Answer

Misfirering one piston Change plug ,plugwires,

You didn't say whether the cylinder was misfiring occasionly or not firing at all. The number of things that could cause that are quite high. From an ignition standpoint, you could have a bad coil or a bad ignition unit. From a mechanical standpoint, your compression could be low. From a fuel standpoint, you didn't say whether your engine was fuel injected or carb equipped, you might not be getting fuel to the cylinder or you might have a vacuum leak at the intake.

Check the spark first. Pull the spark plug wires off but leave the spark plugs in the heads. Install another set of plugs in the wires and lay them on the engine where you can see them. Spin the engine with the starter and watch for spark. If you have spark, is it a bright blue spark or is it a yellow looking spark? The bright blue spark is what you want.

If you have good spark, run a compression test on the engine. Screw a compression tester into the spark plug hole and open the throttle wide open. Spin the engine to test for maximum compression. Write down the reading you get. The squirt about an ounce of oil into each cylinder and run the test again. If the compression comes up more than 10%, it may be time for a top end overhaul.

Try this and repost with information and we'll go from there.

Good Luck

Nov 14, 2010 | 2002 Harley Davidson FLHR - FLHRCI Road...

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

What is the stock carburetor's mm Bore on a 2003 HD FLHR RoadKing

Since I haven't ever heard of an FLHR-Y, I can only guess at the size of the carb. If the engine is the standard twin cam 88" engine, the carb should be a 40mm version. But, if the engine is one of the "factory hopped up jobs" such as a 103" or somthing else, I have no idea of the size of the carb.

Dec 05, 2009 | 2003 Harley Davidson FLHR Road king

1 Answer

Bike acts like its running on one cylinder. At

Have you changed the spark plugs? That is what I'd do first. May be a simple as a fouled or otherwise bad plug.

Oct 17, 2009 | 2000 Harley Davidson FLHR-FLHRI Road king

2 Answers

Oil change directions, 2003 Road King

The drain plug is on the left side of the oil reservoir pointing towards the front of the bike. The motor should be warm when you dump the oil and the o-ring should be replaced as an extra precaution (don't want to waste that new oil if you have a drip). When replacing the oil filter use a piece of tin foil to divert the oil to your waste pan.

Jul 22, 2009 | 2003 Harley Davidson FLHR Road king

Not finding what you are looking for?
2003 Harley Davidson FLHRCI Road King Classic Logo

Related Topics:

163 people viewed this question

Ask a Question

Usually answered in minutes!

Top Harley Davidson Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4481 Answers

Gills Lango

Level 2 Expert

195 Answers


Level 3 Expert

4331 Answers

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

Answer questions

Manuals & User Guides