Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 114Get this manual
HONDA BFROAmESA
5VALVE GUIDE REPLACEMENT
1) Chill the replacement valve guides in the freezer section of refrigerator for about an hour2) Drive the valve guide out of the combustion chamber side using valve guide driver (special tool)CAUTIONVALVE GUIDE DRIVER, 5.5 mm
When driving the valve guides out, be careful not damage the head
3) Remove the new valve guides from the refrigerator one at a
time as needed4) Instal! the new valve guides from the valve spring side of the cylinder headDrive each valve guide as shown5) After installation, inspect the valve guide for damageReplace the guide if damagedVALVE GUIDE DRIVER, 5.5 m
07742-0010100
VALVE GUIDE REAMING