Bingo you have a dead cylinder, now do you have spark?
Pull a plug and see if it is wet and smells like fuel, If it does check your oil and see if it smells like gas.
I have seen a dead spark cause a motor to fail due to gas in the oil causing lubrication failure.
You can check your spark with a new plug, put it in the wire and rest it on the motor and start, see if there is a spark. good to do this where it is darker so see better.
Chad Falstad "Hawk"
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"