2006-2009 Suzuki LT-Z50 QuadSport ATV Factory Service Manual, Page 68Get this manual
DRIVE SHAFT INSPECTION Inspect the drive shaft for wear or damageIf it is worn or damaged, replace it with new one
BEARING INSPECTION Rotate the bearing inner race by finger to inspect for abnormal play, noise and smooth rotation while the bearings are in the those casesReplace the bearing in the following procedure if there is anything unusual