Question about 2002 Harley Davidson XL 1200 S Sportster Sport
Posted by Anonymous on
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
Posted on May 05, 2015
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Posted on Jan 02, 2017
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
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 firstname.lastname@example.org 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
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
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.
Posted on Jul 01, 2011
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