Since two-stroke engines are more polluting, they were banned for most street motorcycles. Still, they are used on lighter applications such as lawnmowers, generators, or go-karts.

And because they work differently, two-stroke and four-stroke engines use different oils, with the low-viscosity two-stroke oil being the more expensive. With Great Power Comes Great Responsibility.

A Closer Look at 4 Stroke Engines. This is how a 4-stroke engine works. (Photo/fauzan/Adobe Stock) 4 Stroke Pros. More efficient than a 2 stroke. Quieter than a 2 stroke. No need to mix fuel and oil.

Karl Benz and others had two-stroke engines running successfully by 1870 which delivered one power pulse per crankshaft revolution versus the two turns required in four-stroke engines.

MAN PrimeServ plans to convert the first four-stroke engines for a pilot customer in autumn 2025, at which stage the package will be made available to the general market.

Based on the popular Renault 1.5L four-cylinder engines used in Europe, this two-cylinder 730cc two-stroke powerplant is designed to be significantly lighter, smaller, and less expensive than a ...