2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 135Get this manual
FSFST Engine Measure Valve Stem Runout Out of specification: Replace valveMeasure Cylinder Block Flatness Out of specification: Replace cylinder blockNOTE: Do not re-surface (shave) cylinder block
Measure Un-Installed Spring Length Out of specification: Replace springMeasure Cylinder Bore Diameter Out of specification: Replace cylinder blockNOTE: Do not re-bore cylindersCylinders are lined with NicasilMeasure Cylinder Head Flatness Out of specification: Replace cylinder headNOTE: Do not re-surface (shave) cylinder headMeasure Cylinder for Taper and Out-of-Round Limits Out of specification: Replace cylinder blockNOTE: Do not re-bore cylindersCylinders lined with Nicasil123Bore: Maximum diameter of DaDfTaper: Maximum of DaDe and DbDfOut-of-Round: Maximum of DaDb and DeDf