Suzuki RM-Z250, Руководство по обслуживанию

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6-16 CYLINDER HEAD, CYLINDER AND PISTON
• Cool down the new valve guides in a freezer for about one
hour and heat the cylinder head to 100 – 150 °C (212 – 302
°F) with a hot plate.

• Apply engine oil to the valve guide hole.
• Drive the valve guide into the hole with the special tools (
1
,
2
).

NOTE:
Install the valve guide until the attachment contacts with the cyl-
inder head
3
.
A
15 mm (0.59 in)

09916-43211: Valve guide remover&installer
1
09916-44920: Valve guide installer attachment
2
• After installing the valve guides, re-finish their guiding bores
using the reamer.
• Clean and engine oil the guides after reaming.

09916-33210: Valve guide reamer (4.5 mm)
09916-34542: Reamer handle
NOTE:
* Be sure to cool down the cylinder head to ambient air temper-
ature.
* Insert the reamer from the combustion chamber and always
turn the reamer handle clockwise.
VALVE SEAT WIDTH INSPECTION
• Visually check for valve seat width on each valve face.
• If the valve face has worn abnormally, replace the valve.
• Coat the valve seat with Prussian Blue and set the valve in
place. Rotate the valve with light pressure.
• Check that the transferred blue on the valve face is uniform all
around and in center of the valve face.

09916-10911: Valve lapper set
Do not use a burner to heat the valve guide hole to
prevent cylinder head distortion.
Failure to oil the valve guide hole before driving the
new guide into place may result in a damaged guide or
head.