I GOT A 2003 FATBOY THATS BEEN BACKFIRING ABOUT A WEEK!! I CHANGE THE FUEL INJECTORS STILL DOING IT>>>> ADDED A POWER COMANDER AND STILL DOING IT>>> CHANGE THE AIR FILTER STILL BACKFIRING!!! IM RUNING OUT OF OPTIONS!!! HOPING SOMEBODY CAN HELP ME HERE>>>> THANKS!!!

 

Cam tensioner gone? I can't imagine it would be that drastic but it's a thought.

 

Plugs, wires, bad grounds........Start with the basics....

 

got all that done!! Its driving me crazy!!

 

Check for loose exhaust fittings. Does this happen on deceleration only? It my be pulling air into the exhaust system causing backfire. Any recent mods ie new exhaust?

 

How many miles? Have you changed anything on the bike just prior? How old is the fuel in the tank? With enough details should be able to narrow this down.

 

ok.........it has a 3 year old tank....basicly its new....bought the bike with a d&d fat cat and stage 1 ac.......never had any problems before.....change the plugs 3 days ago....the cables still in good condition......i had used amsoil for the last 7 years.....change all the injectors 4 days ago.....still doing it!!! Running out of options!!!

 

Exhaust Leak , Cracked header or gasket