I just got my new to me engine in my new to me CBR900 and right out of the gate the engine started like new. It ran about a minute and died like you shot it.
I messed with it till I was sick and came in and browsed some past posts and found some great advice.
I went out with my meter and found no voltage on the coils.
Found the STOP switch went out right there while the bike was running.
I had never had that happen buy I'm glad it's not a big deal.
Best thing was the guidence found right here among the posts.
Brian