1998-2004 Honda Foreman 450 factory service manual, Page 143Get this manual
CYLINDER HEADCYLINDERPISTON VALVE GUIDE REPLACEMENT Chill the replacement valve guides in the freezer section of refrigerator for about an hourHeatthe cylinder head to 100150C (212302F) with hot plate or oven
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To avoid burns, wear heavy gloves when handling the heated cylinder head
CAUTION:
Do not use torch to heat the cylinder head; it may cause warping
Support the cylinder head and drive out the valve guides from combustion chamber side of the cylinder head using the specia tool as shownTOOL: Valve guide driver, 5.5mm
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Replace new a-ring on the new valve guideDrive in the guide from the top of the head using the special tool as shown TOOL: Valve guide driver, S.Smm