2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 73Get this manual

2009 Polaris Scrambler 500 4x4 2x4 factory service manual, Page 73

VALVE SEAT SERVICE Valve Seat Inspection Inspect valve seat in cylinder head for pitting, burnt spots, roughness, and uneven
valve seats must be reconditionedRefer to Valve Seat Reconditioning for procedureCAUTION: Wear eye protection when performing
cylinder head serviceValve guide replacement will require heating of the cylinder headWear gloves to prevent burnsValve Guide
RemovalInstallation 1Remove all carbon deposits from the combustion chamber, valve seat and valve guide area before attempting
to remove valve guidesCAUTION: Carbon deposits are extremely abrasive and may damage the valve guide bore when guides are
removed2Place new valve guides in freezer for at least 15 minutes while heating cylinder head3Heat cylinder head in an oven
or use hot plate to bring cylinder head temperature to 212 (100 C)CAUTION: Do not use torch to heat cylinder head or warpage
may result from uneven heatingHead temperature can be checked with pyrometer or welding temperature stick COMBUSTION CHAMBER
VALVE SEAT RECONDITIONING Follow the manufacturers instructions provided with the valve seat cutters in the Valve Seat Reconditioning