1989 Honda FL400R Pilot Service Manual, Page 176Get this manual
REAR WHEELSUSPENSIONDRIVE SHAFT INSPECTION
Turn the wheel hub with your handThe wheel hub should turn smoothly and quietlyReplace the knuckle bearings if the wheel hub does not turn smoothly and quietlyBearing replacement; see next page
Inspect the knuckle ball joint rubbers for tears or other damage by joggling the ball joint endIt should move freely and smoothlyReplace the ball joint if necessary