1989 Honda FL400R Pilot Service Manual, Page 69Get this manual
CYLINDER HEADCYLINDERPISTON
CYLINDER HEAD REMOVAL
Drain the coolant (page 5-4)Disconnect the spark plug capRemove the spark plug wire guide and ground cableRemove the spark plug from the cylinder head
Disconnect the coolant hoses from the cylinder headRemove the cylinder head nuts
To avoid warping the cylinder head, use crisscross pat-
tern to loosen each nut about 14 turn at time, then remove the nutsRemove the cylinder head and gasket
DECARBONIZING
Remove the carbon deposits from the combustion chamber