2010 Polaris Sportsman 850 Service Manual, Page 142Get this manual

2010 Polaris Sportsman 850 Service Manual, Page 142

ENGINE Counterbalance Shaft RemovalInspection 1Note timing marks on balance shaft drive gears and crankshaft drive gearShafts
shaft bearings NOTE: Due to extremely close tolerances, balance shaft bearings must be inspected visually and by feelLook
for signs of discoloration, scoring, galling or contamination from moisture or dirtTurn bearings on shaftBearings should
turn smoothly and quietlyThe outer race should be firm with minimal side to side movement and no detectable up and down movementReplace