Try going up a few sizes on the main jets. Because you now have a more free flowing exhaust and more air flow thru the intake with the K&N. It needs to be rejetted.
SOURCE: 2003 883 sportster wont start
What u are describing is typical of a faulty ignition system, but could also be a fuel problem. I check by removing the aircleaner and rotating the throttle. If u see a nice spray of fuel, thats probably not the problem. Check for a spark at the plugs. I can explain how if you need me to. If you cant see a good spark, U have an electrical problem. I had a crank position sensor go bad on me. Dont do what I did (replaced the battery, ignition, and regulator as part of my diagnosis procedure)
SOURCE: acceleration problem
If you are not running an open or free flowing exhaust go back to the stock size jets but use the DynoJet parts instead of the stock.
DJ jets tend to run bigger than oem jets
SOURCE: 1978 Shovelhead has a miss or backfires through
Make sure your hotwire to the coil is making a good connection. Check air intake manifold for air leak - o-rings can be tricky to get installed correctly. Finally, change carburator jet to richer mixture. Popping backk through the carb means lean fuel mixture.
SOURCE: when it warms up it miss fires
I had the same problem with my 04 1200C. It was a defective crank position sensor. replaced the sensor and no problems since.
Good Luck
SOURCE: fuel leak on my 2000 sporster 1200c
i agree with you. i had the same thing happen to me varnish on float caused it to stick in the down position when i turned the gas on it would flood out i had to change my oil to. did you stablize it if not get the carb. cleaned and make sure you fog the cylinders and add fuel stablizer to gas dont run it empty and think its good enough its not.
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