Question about 2002 Harley Davidson XL 1200 S Sportster Sport

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NOT firing out of front cylinder have new plugs new coil new wires

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  • Harley Davidson Master
  • 42,918 Answers

Hi Anonymous, check compression and do a leakdown test could have bent valve, also check all pin connections at ignition module. Please visit website below for more suspects:
Harley Davidson Sportster error codes and how to access them
Good luck

Posted on May 05, 2015

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Posted on Jan 02, 2017

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rselvy
  • 83 Answers

SOURCE: Rear cylinder not firing

The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

Posted on Dec 08, 2008

OneRide
  • 379 Answers

SOURCE: 1998 ultra have a new coil on it still firing on

Bad plug wire or plug. Also, possibly reversed the pos and neg wires when you installed the new coil.

Posted on Jun 26, 2009

wd4ity
  • 4565 Answers

SOURCE: no fire at the plugs, battery fine, was running

Your Sporty has a fuse box somewhere. check the fuses to see if any are blown. Harley always puts their ignition systems on their own circuit. If you don't find anything that way, contact me directly at wd4ity@bellsouth.net and I'll scan a trouble shooting chart in and send it to you. There's more to the late models than there was with the early models.

Posted on Apr 21, 2010

  • 6 Answers

SOURCE: my front cylinder is not firing. I replaced plugs

hi you must check compression first should be same as other cyl. if not check for tight tappet if ok is the plug sparking if you hold it against cyl and turn over motor if good spark put it back and turn over motor few times then remove it and see if its wet with fuel if its not could be carby blocked jet

Posted on May 25, 2010

wd4ity
  • 4565 Answers

SOURCE: I have a 1991 FXR Super Glide with a front

You need to run a compression test on the engine. The cylinder pressure should be around a hundred pounds or more. There should be no more than 10% difference between the cylinders. If the compression is low enough to cause it not to fire, you probably have a blown head gasket.

You didn't mention what kind of igntion system you have in the bike. If you have the original ignition system, it's a dual fire system and both spark plugs fire at the same time every time the pistons come up to top dead center. This means that one cylinder fires on the exhaust stroke and this is called a "wasted spark" system. Harley has used this type of ignition for almost all their Bit Twins and Sportsters for many years. If your bike has an after market single fire ignition system, the ignition system could be bad causing the missfire. In this case, you would have an aftermarket coil as well with three primary connections on it.

Good Luck
Steve

Posted on Jul 01, 2011

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The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

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No rear spark, put on new coil, new plug wires and new crank position sensor, still only running on front cylinder.


I had almost the same thing happen on my 03 sportster it was the ignition modual dont know what year yours is but 03s are bad about messing up harley said they fixed the problem on the replacements

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