MY Early 1/2 year 2000 FXDS.... Yes there were problems with the Crank sensors in the first two years of the twin cams. They came out a little too long and had a problem on the early bikes. I replaced my 00 bike and that solved the problem (twice). BUT it never restarted once it quit... It did pop and backfire though... THEN Nothing...
Even though it sounds like the sensors to me, it may be the coil.
The cam sensor I also replaced and didn't need to be (it was the crank both times)... A little melting of the cam sensor, what.ever.it.is, was not the problem. I paid just under 100$ Each, getting them at a HD dealer.
That was about 7 years ago... Told I was lucky to find them... ?
The crank sensor can act like the coil going out. The easy way to replace the LONG wire that goes from the sensor down and into a wire Loom is a difficult process... After the HD shop BUTCHERED the wire harness it went thru, I just went my own direction on the second one (not warrantied) and kept it out of the cover and tied it appropriately where needed... for easy install and removal IF necessary AGAIN...
Symptoms stated: for MY crank sensor... Back firing/quit running/No start.
Has your bike HAD the Ball style rear cam bearing replaced to the full style Roller cam bearing ? ... A Must Do if not... OR some day BANG.....
ALL 99 and Early 1/2 year 00's needed it done (IMO and others who owned them) before they Blew...
signed....BUBBIE