Honda CBR125R, Руководство пользователя

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CYLINDER HEAD/VALVES
8-19
While the cylinder head is still heated, take off a new
valve guides from the freezer.
Drive the guides in the cylinder head from the cam-
shaft side.
After installing the valve guides, measure the valve
guide height from the cylinder head.
Let the cylinder head cool to room temperature.
Ream a new valve guides.
• Use cutting oil on the reamer during this opera-
tion.
• Take care not to tilt or lean the reamer in the
guide while reaming. Otherwise, the valves may
be installed slanted, causing oil leakage from the
stem seal and improper valve seat contact. This
may prevent valve seat refacing
• Insert the reamer from the combustion chamber
side of the head and always rotate the reamer
clockwise.
Clean the cylinder head thoroughly to remove any
metal particles after reaming and reface the valve
seat (page 8-20).
VALVE SEAT INSPECTION
Clean the intake and exhaust valves thoroughly to
remove carbon deposits.
Apply thin coat of Prussian Blue to each valve face.
Tap the valve against the valve seat several times
using a hand lapping tool without rotating valve to
make a clear pattern.
Remove the valve and inspect the valve seat face.
The valve cannot be ground. If the valve face is
burned or badly worn or if it contacts the seat
unevenly, replace the valve.
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 driver
07743-0020000
SPECIFIED HEIGHT:
IN: 11.5 – 11.7 mm (0.45 – 0.46 in)
EX: 12.3 – 12.5 mm (0.48 – 0.49 in)
VALVE GUIDE DRIVER
VALVE GUIDE
TOOL:
Valve guide reamer, 5.0 mm
07984-MA60001
VALVE GUIDE REAMER
HAND LAPPING TOOL
UNEVEN SEAT
WIDTH DAMAGED FACE