2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 137Get this manual
FSFST Engine Measure Rocker Arm Axial Play Out of specification: Replace rocker arm, rocker arm towerMeasure Crankshaft Deflection at Several Locations Out of specification: Replace crankshaft
Measure Crankshaft Main Bearing Journal Diameters Measure Rocker Arm Axle O.D Out of specification: Replace rocker arm axle Out of specification: Replace crankshaftMeasure Crankshaft Connecting Rod Journal Diameters Measure Rocker Arm Tower Bore I.D Out of specification: Replace rocker arm tower Out of specification: Replace crankshaft