SOURCE: Harley spits and sputters.
Unless an aftermarket device has been installed on your bike, you must take it to a dealer to get the fuel map reworked.
SOURCE: 883 to 1200 conversion just completed on 2007
Enrich the fuel mixture by going to a bigger low speed idle jet.
SOURCE: bike runs great. until it
I have 2008 1584cc Dyna. It slowly started runnig rough and backfired. Then after riding a minute it starts running kind of badly, but backfiing every now and then like a shot gun.I haven't checked the plugs yet, but the air cleaner looks as if no air could get throught it. Can a real bad cleaner cause this? signed confused.
SOURCE: I have a 2003 softail deuce, hard starting, spits and sputters at low speed and on highway.
make sure you have good fuel pressure. Your pump or something else in the fuel system may have failed.
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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