Let's explore some of the world's fastest engines and motors by how many revolutions per minute (rpm) they can turn; and no, none of these engines are found in road cars or even motorcycles.

The Pulsar 125 feels comfortable cruising at 80kph at around 6,000rpm, but once you go above it, the engine starts feeling strained and one can feel minor vibes on the seat, footpegs and handlebars.