Question about 2002 Harley Davidson FLHR - FLHRCI Road king
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.
Posted on Nov 14, 2010
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Posted on Jan 02, 2017
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