Hi was wondering if you can buy siliencer in seperate bits! fired bike up today & noticed it sounded loud so i pulled siliencer off and apart to find all packing was just about gone & plastic end cap & rubber ring were melted! i only repacked it about a month ago using a beta preformed packing! as any one else had this problem? & why should it have melted end cap! i have changed packing plenty of times before and not come across this problem!