1996 Fat Boy Backfiring

Discussion in 'Softail Models' started by my1stharley, Jul 23, 2009.

  1. my1stharley

    my1stharley Banned

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    Im new to the forum, and to the harley davidson world. It seems to me that you are the people to go to when it comes to carb adjustments. I bought my 96 fatboy about a month ago. It has 2400 orig miles and has been pretty well taken care of. When I got it, it backfires through the carb when I first give it gas, then straightens out until I chop the throttle or the rpms get low at cruisiing speed. The previous owner installed a se kit that replaced the backing plate for the air filter and added the kn filter. I am pretty sure he didnt jet it and this is where my problem is. I am sure the rest of the bike is stock as far as performance. It may have a set of pipes or slip ons on it because it says "for offroad use only" on the back of the mufflers but im not positive of this. I have already adjusted the mixture screw, but after 4 turns out from seated I stopped because I knew it wasnt going to work. I have already did complete engine,primary, and trnny changes and also ran carb cleaner through the system as it has been ran since 2006. Been 3 or 4 tanks of premium ran through and its getting no better. Any suggestions would be greatly appreciated. Thanks in advance.
     
  2. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    Welcome to the Forum. Lots of good stuff here and in the heads of your fellow members.

    On your bike, start here:

    *Twin Cam CV Carb Rejet Suggestions - Harley Davidson Community

    Pix here:

    CV Carb Rejet Pics - Harley Davidson Community

    More stuff:

    CV Carb Tuning - Harley Davidson Community

    Jetting CV Carbs - Harley Davidson Community

    TQ
     
  3. my1stharley

    my1stharley Banned

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    tonight I tore the carb apart and put the 2 washers in. I havent jetted it or nothing, and I havent got to ride it as it was so late and the neighbors are already hating my loud bike. lol. I did start it up and it started tho so thats a plus. Ill post tomorrow and let everyone know what happens. Thanks for the info.
     
  4. my1stharley

    my1stharley Banned

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    K. I just got back from a ride and the problem was partially solved. It doesnt do it no where near as much as it was, but there is still a hicup everyonce in a while. It still doesnt seem like all the power is there that should be tho. Ill prolly wait til winter, then do the jetting. Im gonna say a #46 low speed jet and a 190 high speed jet will do the trick. Thanks for all the help.