1987-2003 Yamaha YFZ350 Banshee supplementary service manual, Page 219Get this manual
REAR SHOCK ABSORBER AND SWINGARMS
FREE PLAY INSPECTION 1Check: Swingar (Side play)) Out of specification+Replace swingarm or bearingsSwingarm up and down movement Tightness1Binding1Rough spots+ Replace bearings
Remove the rear wheel and rear axleRemove the shock absorber and swingarrn securing boltInspect swingarm side play by moving it from side to side(There should be on noticeable side play! Inspect swingarm up and down movement by moving it up and downINSPECTION Rear Shock Absorber Inspection 1Inspect: Shock absorber rod BendslDamageReplace the shock absorber assembly