1996 Sportster 1200 Custom with factory Screaming Eagle Carb (Kehin). Im going to be very detailed as possible so I can maybe get the help im looking for. One evening I had rode my bike and it was riding fine. I let it cool down all the way for several hours. I then cleaned the bike. I used a rag and sprayed H-D cleaner on the rag and wiped it down. I stored it in my garage. The next day I got up and left on the bike and shortly after starting it, it started missing and acting up and sounding very strange. I came back and started checking things. I had put new plugs in the bike approx 2 months ago. I went ahead and stopped and got new plugs and put them in. Nothing changed! I looked at the old plugs, they appeared normal, if anything maybe a little lean. As we all know you have two spark plug wires, one longer than the other. One for the front cylinder and one for the back (which is the longest plug wire). I started the bike and pulled the plug on the front cylinder and the bike died. Started it back up and pulled the plug on the back and it ran. I put the long wire (goes on the back cylinder) on the front and it ran. I rotated the plug wires on the coil pack also. Same results as earlier. I emptied the float bowl and still same problem. I can however keep the back cylinder running if i keep the choke pulled though. When its idling it sounds sick and when I give it gas and rev it up it seems to kick the back cylinder in. Im lost in words for what to do....Please help if you may know whats going on!!!! Thanks so much!!