These motorcycle had De Dion-Bouton's air-cooled four-cycle engines of 347 cc.

In 1909 he completed the construction of a four-cycle engine.

Due to a 50% longer stroke duration than a four-cycle engine there is more time to complete the combustion.

All engines in this line are four-cycle, single-cylinder, air-cooled engines.

The on-going price of two-cycle fuel/oil mixture is higher than regular gas for four-cycle engines.

But most throwers have four-cycle engines, and on those the oil and gasoline are added to separate reservoirs.

Vehicles are powered by a small four-cycle engine.

The quietest products are powered by electricity, while the noisiest are gas-powered with two- or four-cycle engines.

Because these larger machines have four-cycle engines, they are also very noisy.

Two-stage machines have four-cycle engines that use gasoline right from the pump.