Of course its one!
Ask any rider in the developing world, one is all you need to go anywhere
in agreement are trials riders, speedway riders, enduro riders
a large number of adventure riders, even lots of pizza delivery riders
maybe two cylinders are more your style, a bigger adventure bike, or street touring and race bikes
Three cylinders are more of a rarity except for the modern Triumph that ADVriders are familiar with
but they do exist
four cylinders again more common than three, and have been since the early days of motorcycling
How about 5 cylinders? Anyone? They do exist, a radial motored board tracker was built with five cylinders, if you want to see an example in perfect condition then you need to travel to England and the Sammy Miller Museum
Six cylinders the obvious answer is the Honda CBX or the Goldwing as mass production version, but how about the V6 Horex
Seven cylinders, step up America’s bad boy and inmate Jesse James and a one off custom radial engined bike called Radial Hell
Eight cylinders, of course you think of the Boss Hoss, but what about Glenn Curtiss V8 record holding bike I wrote about here or a not so well dressed V8 motorcycle rider as an alternative option
Nine cylinders? Of course why not!
Ten cylinders, the Dodge Viper powered Tomahawk of course
Eleven cylinders just don’t exist but of course, 12 cylinder bikes do but are rare and more cylinders are even rarer. A 24 cylinder bike was built using chainsaw motors
If you are sitting there thinking more is better then you think along the same lines as Simon Whitlock who built a 48 cylinder motorcycle called Tinker Toy and he explains it in great detail in this short documentary And what it sounds like running …