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Without any real detail about year, filter type or where the oil actually is "in" the carb I will try to answer. Oil can come from a few sources. The first is the breather tubes from the engine. If there is excessive blow-by the pistons, oil will be drawn into the carb through these tubes. There are also rubber check valves on top of the heads that can harden and cause the same issue. The last one is excess oil from a oiled cotton style filter (K&N). Either way, while in the garage, remove the air cleaner but leave the breather tubes connected. Get the motor up to temp and watch the tubes while reving the motor. If you see a heavy oil mist from the tubes perform a leak down check on each cylinder to identify the problem area.
excessive oil comming from breathers combined with the pipes being black could be blowby depending how long ago the conversion was done if it was just done someone didnt check ring clearance or put a ring in upside down if it wasnt just done proabley time to start saving for a top end job till then nothing you can do but ride it
This could be the air filter, check and clean it, then go ride to see if the cleaning cured it. Also check the breather tube for the blow by from the heads where it dumps into the air filter assembly, if something is partially plugging them it could cause this. It could also be the fuel mixture isn't quite right, and needs adjusted. The only way to pull the codes is to find a shop with a code reader. Most likely it's going to have to be an HD dealer, but you can check with some of the smaller shops locally. I'm really getting irritated with HD for going to the electronic era and making their bikes as hard to work on as some of the cars now days. Their not simple anymore, and what used to be a simple diagnostics is turning out to be a major event. This is why I like my 95 model, old, carbed, simple!!! Anyway, Ive ranted enough, hope this helps in solving the problem. If you need anything else, just ask.
Most likely the ignition module. Use an ohm meter or test light, and start tracing back from the plug wires until you get power. Could also be the coil, but I'll bet that you find power to, but not from the ignition module. There should be a couple of relays inline there too. Hopefully you just popped a relay. Let me know what you found.
Your crankcase is not breathing right. Re-Check your lines going into the air filter back plate, make sure the lines are not kinked in any way. Also make sure the lines are not dry rotted.
The Rev. Kid Kev