SOURCE: Hard starting when cold, runs rough at idle and any steady speed.
Your carburetors need to be cleaned. The pilot jets are at least partially plugged.
If you are comfortable doing this yourself, you need to remove the seats, fuel tank, and air induction system before you will be able to get the carbs out. Be carefull when removing the fuel tank, there is a wire harness that will need to be un plugged from it to remove it. The wire harness plug runs under the plastic tray under the seat. There are 3 plastic rivits that will need to be removed to get to the plug. The carbs come out as a pair, and can be tough to get back in the boots.
You need to remove the float bowls, remove the jets, and blow carb cleaner and compressed air through them all. The pilot jets are most likely the only culprit, but you might as well clean everything if your going to all the trouble. You should also blow carb cleaner and compressed air through all of the other passages while your at it. Make sure that you can see through the jets and there is no debris left in them. Make sure to clean the floats, needle valves, and float bowls as well.
Then re-assemble
This happens when the bike sits for long periods. The fuel we get now days has a very short shelf life before it goes bad. Fuel oxydizes over time, and it happens even faster in a small amount that is vented which is exactly as it is when its in the carburetors of a motorcycle. When fuel oxydizes and evaporates, it leaves a gummy mess behind. The pilot jets are the smallest passages that sit in the fuel, so they naturally plug first.
You can prevent this by keeping fuel stabilizer in your fuel when ever the bike will be sitting for long periods of time. Myself personally, when I store one for the winter, I like to leave the carbs empty.
SOURCE: Rear cylinder not firing
The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.
SOURCE: 2003 dyna lowrider,sputters spits and coughs.clears up when you p
Check HT leads, connection and the spark at the plug to see if it nice and bright.
Is the battery charged fully or is it old? They don't last very long on Harleys.
See if the regulator is any good ( dealer or friend swap if possible to check).
SOURCE: New MasterCut mower runs erratic & gasoline leak around fuel cap.
as it is a new machine if it has not been p.d.id by dealer it may be that some test fuel residue is in carburettor which is causing this,you need do drain of carburettor of all fuel,remove bowl and spray clean useing either air or carb cleaner spray(should get from local autoparts store) note try to spray up centre of carb as may be a jet up there as well,refitt bowl and make sure you use fresh fuel this should solve problem,with unstable running fuel may be finding a way back through breather at carb with the vibration and may be cured after you have done carb
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