GILERA RC 125 S

2 WEEKS AGO I BUY THE GILERA RC 125 SPORT PRODUCTION. IT IS THE ENDURO MOTO WITH 30 KS MACHINE. THE PROBLEM IS THAT I DONT HAVE THE PISTON AND CILINDER OF IT. I WAS IN ITALY (IM FROM CROATIA) AND THEY SEY NO CHANCE.YOU CANT FIND THE CILINDER FOR THAT TYPE OF GILERA. IT IS ONE WITH CARBURATOR IN CARTER NOT IN CILINDER.
EXPERIENCE OF SOMEONE??
WHITCH CILINDAR I CAN PUT ON IT.THE HONDA NSR HAVE THE CARBURATOR IN CARTER, MAYBE THAT CILINDER? ?