I was watching this vid (Impressive skills at 4:06 btw) and got to wondering.
Why do they still make one cylinder bikes? Now I'm not a bike guy (don't ride and never took to the idea of a motorcycle, but I've a respect for them and do appreciate them and those who ride them) so I'm coming in as an outsider here.
Surely multi-cylinder machines are quieter, smoother mechanically and more economic for the power and torque they produce.
Also extending the same question to cars (dilberately kept the title as open as possible). Why is the V10 not the universal work horse that the V8 is, It fits between the 8 and the 12, two popular cylinder counts yet the 10 has appeared fewer times than both.