Hello. I have a 2001 883. A few weeks back I tried to start it and got no spark. I changed out the speed sensor and she fired right over. The next day I tried to start it and lost spark again. Has anyone else had this problem? I'm running out of options. I replaced the plugs,wires and coil pack.

 

I would check for 12v at the coil when the motor is turning over. Could be an intermittent loss of connection.