My 2006 dyna fxd spits and sputters, looses power then regains power and back fires. I replaced the battery and regulator cover. What could be my problem?

SOURCE: When bike gets worm it runs like ****

Since you have thrown the entire ignition system at it, let's think about fuel. If you were running out of gas it would act as you described. I would start by removing the float bowl. Be careful not to spill any gas because we want to look at the level. It should be over half full. Check the float movement. You should be able to push it up without resistance. Looking from the bottom remove the phillips screw that retains the float axle and the float and needle valve should fall out. If the needle valve has three sides or if the rubber tip is worn, replace it. The 3 sided valves have a tendancy to stick closed and all dealer stock should be the 4 sided version by now. After you re-install the float, leave the bowl off and follow the small vacuum hose from the petcock to the carb. Pull it off at the carb end. Look to make sure it isn't damaged. **** lightly (sorry) or use a vacuum pump on the hose. With the petcock on and gas in the tank, a healthy stream of fuel should pour from the needle valve. If not, the petcock diapragm is shot. If none of this helps, take it for a ride and when it acts up, crack the fuel cap loose and if it takes off the vent in the cap is malfunctioning.

SOURCE: my 2006 dyna street bob efi back fires

that is usually caused by a too rich main jet
dumping too much fuel and it is igniting it in the pipe

SOURCE: spits sputters and backfires

carborator needs to be cleaned and the float needs to be reset

SOURCE: not charging the battery as i ride 2002 dyna fxd

heck all connections especially the one thru the motor to the regulator-check battery to make sure levels are good and have it load tested

SOURCE: how to change oil in 2003 HD FXD Dyna Super Glide

remove the drain plug from the oil pan, you will need either a 3/4" box wrench or a 5/8" box wrench and the drain plug will be facing forward on the the oil pan. It is easiest to remove this drain plug from under the right side of the bike. put drain plug back in after about 10 m,inutes of drain time and tighten to 18 ft. lbs. Dont forget to change the oil filter as well.