Subtle diff between "working" and being supported to be heeded attention to here -
By v-twin engine would also fire up with a single spark-plug alright but I would never do it because not only would it hurt the performance but also it makes no sense at all as it bringe sthings out of balance and it defies the purpose of a v-twin. (lame analogy but the best I could conjure up so early with only 2 sips out my jug of java)
cheers
r.