Check the Swing arm pivot bushing "Cleve Blocks" for failure or leakage of sticky silicon fluid. If bad, replace with solid "BEARING BRONZE" bushing kit Part No. 20-19E.
CHECK for OLD hard oil lines before installation, the lines have to be pushed aside during installation. 1991 and 1992 FXR where interference is involved one must use new HD part #72023-51D switch with braided brake line and after market banjo bolt, then bracket fits with no problem.