All the products I've tried it on the belt, one that lasts 300/400km dry weather is Marseille soap, I made ​​15 days in an inflated plastic bag with a little water to that'' it becomes a little soft after I apply only on the sides of the belt, I discovered this by finding the plastic bag that was lying in a corner of my garage while my mtw expected to be repaired (5 months). Is good news if morgan is making steel rear sprockets as some bikes Buel. View on ebay I think it must corespondre the good dimensions.
http://www.ebay.com/itm/BDL-POLISHED-BILLET-65-TOOTH-REAR-PULLEY-FOR-HARLEY-1-1-2-DRIVE-BELTS-BIG-TWINS/331105899524?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D21235%26meid%3D8060516471100997065%26pid%3D100005%26prg%3D9374%26rk%3D2%26rkt%3D6%26sd%3D261518438893&rt=nc