Honda SH300I 2006, Manual

Page: 231 / 511

CYLINDER HEAD/VALVES
9-15
Use cutting oil on
the reamer during
this operation. Take
care not to tilt or
learn the reamer in
the guide while
reaming.
Ream the new valve guides.
Insert the reamer from the combustion chamber
side of the cylinder head and always rotate the
reamer clockwise.
Clean the cylinder head thoroughly to remove any
metal particles after reaming and reface the valve
seats (page 9-16).
VALVE SEAT INSPECTION/REFACING
INSPECTION
Clean the intake and exhaust valves thoroughly to
remove carbon deposits.
Apply a light coat of Prussian Blue to each valve
seat.
Tap the valve against the valve seat several times
without rotating the valve, to check for proper valve
seat contact.
The valve cannot be
ground. If the valve
face is burned or
badly worn or if it
contacts the seat
unevenly, replace
the valve.
Remove the valve and inspect the valve seat face.
The valve seat contact should be within the speci-
fied width and even all around the circumference.
If the seat width is not within specification, reface
the valve seat.
Inspect the valve seat face for:
• Damaged face:
– Replace the valve and reface the valve seat.
• Uneven seat width:
– Replace the valve and reface the valve seat.
TOOL:
Valve guide reamer, 4.5 mm
07HMH-ML00101
VALVE GUIDE
REAMER
HAND-LAPPING TOOL
STANDARD: 0.90 – 1.10 mm (0.035 – 0.043 in)
SERVICE LIMIT: 1.5 mm (0.06 in)
SEAT WIDTH
DAMAGED FACE UNEVEN SEAT WIDTH