Air-cooled 4-cylinder naturally aspirated engine in inline arrangement. 4- and 6-cylinder engines also with turbocharging and optional charge air cooling. Low noise emissions due to acoustically optimized components with very smooth running and high durability. Also available with an electronic motor regulator (EMR) to allow easy integra- tion into the electronic device control and monitoring system. Best cold starting performance even under extreme conditions. Easy, inexpensive installation due to minimum weight and small installation space. The robust engine design allows world- wide operation even with high sulphur fuels. Highly efficient injection and combus- tion system ensures optimum engine performance at low consumption. A very good load response ensures an immediate power supply.