RE: DA-50R flameout
It's pretty rare for the sensor to just go like that. Not saying it doesn't happen, but it is rare. You can blow them on many ignitions if you try and check spark without grounding properly.
RTK / Pat answered your questions correctly.
My question would be did you try and start it afterwards?
Have you checked your clunk?
What kind of battery are you using? What is your battery voltage?