Injini engaphandle kwesikebhe iyisistimu yokuphefumula ebekwe ngaphandle kwesikebhe. Ivamise ukuba nenjini, u-gearbox kanye nophephela, konke kufakwe kuyunithi eyodwa. Lawa ma-motor aklanyelwe ukususwa kalula futhi anamathiselwe ku-transom yesikebhe, okuvumela ukufakwa nokugcinwa okuqondile. Izinjini zangaphandle ziza ngobukhulu obuhlukahlukene kanye nezilinganiso zamandla ukuze zivumelane nosayizi abahlukahlukene besikebhe kanye nezinhlelo zokusebenza.