Ok got the year . NOT Euro 4 .. Now are you sure it is YB ? That is mostly yellow with a black stripe ? Or is it BY , mostly black with a yellow stripe ? BY black/yellow on post 2013 is low fuel light going to speedo cluster. YB yellow/black is not used until Euro4 again and that is called speedo , speed sensor input to speedo cluster . On POST DEC 2013 the speedo sensor input to the cluster is red screened cable. ON PRE DEC 2013 the YB yellow/black un-screened wire was the speedo sensor input .. So maybe NOT USED on your bike ?