Question about 2002 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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2002 Harley Ultra Classic backfires

My harley backfries sometime at take off has 45,000 miles tried new plugs has aftermarket mufflers bought used so dont know much about bike

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This sort of problem is associated with excess fuel in the cylinder that is on itsexhaust stroke. Unless you have replaced the ignition system and changed to single fire, you are sparking the cylinder that is on its exaust  stroke too. So if there is excess fuel in the cylinder and the valves are open, you can get a backfire when the plug fires.
get the bike serviced and whole fuel tank and external area cleaned .and then refill the fuel in the tank and check out. ----------------------------------------- if this does not solve your problem then .....in your bike there is engine coil the resistance of that coil should be exact between 4-6 ohms.if its more then 6 or less then 4 you will get a backfire .if its faulty the coil pack needs replacement.get it checked at ant garage center for the resistance of coil pack. please do rate the solution. thank you for using fixya.keep updated.thanks.

Posted on May 18, 2009

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2. Spark plug cables in bad condition or leaking.
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