▁power plant ▁in ▁the ▁majority ▁of ▁Duc ati - mar qu ed ▁motor cy cles . ▁Duc ati ▁has ▁also ▁manufact ured ▁engines ▁with ▁one , ▁two , ▁three ▁or ▁four ▁cyl ind ers ; ▁operated ▁by ▁pull ▁rod ▁val ves ▁and ▁push ▁rod ▁val ves ; ▁single , ▁double ▁and ▁triple ▁overhead ▁cam sh aft s ; ▁two - stroke ▁and ▁even ▁at ▁one ▁stage ▁manufact ured ▁small ▁dies el ▁engines , ▁many ▁of ▁which ▁were ▁used ▁to ▁power ▁boats , ▁gener ators , ▁garden ▁mach in ery ▁and ▁emer gency ▁p umps ▁( for ▁example , ▁for ▁fire ▁fighting ). ▁The ▁engines ▁were ▁the ▁IS ▁series ▁from ▁ ▁air - co o led ▁and ▁the ▁larger ▁tw in ▁DM ▁series ▁water - ▁and ▁air - co o led . ▁The ▁engines ▁have ▁been ▁found ▁in ▁all ▁parts ▁of ▁the ▁glo be . ▁Wisconsin ▁Dies el ▁even ▁assemble d ▁and ▁" bad ge ▁engine ered " ▁the ▁engines ▁in ▁the ▁USA . ▁They ▁have ▁also ▁produced ▁out board ▁mot ors ▁for ▁marine ▁use . ▁Currently , ▁Duc ati ▁makes ▁no ▁other ▁engines ▁except ▁for ▁its ▁motor cy cles . ▁ ▁On ▁current ▁Duc ati ▁mot ors , ▁except ▁for ▁the ▁Des m osed ici ▁and ▁ 1 1 9 9 ▁Pan ig ale , ▁the ▁val ves ▁are ▁actu ated ▁by ▁a ▁standard ▁val ve ▁cam ▁sh aft ▁which ▁is ▁rot ated ▁by ▁a ▁timing ▁bel t ▁driven ▁by ▁the ▁motor ▁directly . ▁The ▁teeth ▁on ▁the ▁bel t ▁keep ▁the ▁cam