Valve Guide Replacement - Honda CBR650F Service Manual

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CYLINDER HEAD/VALVES

VALVE GUIDE REPLACEMENT

Disassemble the cylinder head (page 10-12).
Chill new valve guides in a freezer for about 1 hour.
• Be sure to wear heavy gloves to avoid burns when
handling the heated cylinder head.
• Using a torch to heat the cylinder head may cause
warpage.
Heat the cylinder head to 130 – 140°C (266 – 284°F)
with a hot plate or oven. Do not heat the cylinder head
beyond 150°C (302°F). Use temperature indicator
sticks, available from welding supply stores, to be sure
the cylinder head is heated to the proper temperature.
Support the cylinder head and drive the valve guides [1]
out of the cylinder head from the combustion chamber
side.
TOOL:
[2] Valve guide driver, 4.5 mm
Take out new valve guides [1] from the freezer.
While the cylinder head is still heated, drive new valve
guides from the camshaft side until the exposed height
is specified value.
TOOL:
[2] Valve guide adjusting driver 07743-0020000
SPECIFIED HEIGHT:
IN/EX: 12.70 – 13.00 mm (0.500 – 0.512 in)
Let the cylinder head cool to room temperature.
Ream new valve guides after installation.
• Take care not to tilt or lean the reamer [1] in the
guide while reaming.
• Use cutting oil on the reamer during this operation.
Insert the reamer from the combustion chamber side of
the cylinder head and always rotate the reamer
clockwise.
TOOL:
Valve guide reamer, 4.5 mm
Clean the cylinder head thoroughly to remove any
metal particles after reaming and reface the valve seat
(page 10-15).
10-14
07HMD-ML00101
[1]
07HMH-ML00101
[1]
[2]
[1]
[2]