https://docs.emtronaustralia.com.au/engine-management/config/engine/engine-main/index.htmlEngine Type This entry designates the engine type. There are 2 type of engine which the Emtron ECU’s can control : 4 Stroke - This the most common engine type. An engine cycle lasts two engine revolutions. 2 Stroke - Less common engine type. An Engine cycle lasts one engine revolution.Hugoen-us