Suzuki GZ250 Service Manual page 63

3-27 ENGINE
VALVE STEM WEAR
Measure the valve stem O.D. using the micrometer. If it is out
of s pecification, replac e the valve with a new one. If the valve
stem O.D. is within specification but the valve stem deflection
is not, replace the valve guide. A fter replacing the valve or
valve guide, re-check the deflection.
09900-20205: Micrometer (0-25 mm)
Standard
Valve stem O.D.
IN.: 5.460-5.475 mm (0.2150-0.2156 in)
EX.: 5.445-5.460 mm (0.2144-0.2150 in)
NOTE:
If valve guides have to be replaced, refer to the valve guide
servicing steps below.
VALVE GUIDE SERVICE
* Remove the valve guide using the special tool.
09916-44910: Valve guide remover/installer
NOTE:
* Discard the removed valve guide subassemblies.
* Only oversized valve guides are available as replace-
ment parts.
• Re-finish the valve guide holes in the cylinder head using
the special tools.
09916-34561: Valve guide reamer (11.3 mm)
09916-34542: Handle
NOTE:
Insert the reamer from the combustion chamber side and
always turn the reamer handle clockwise.
• Install a ring onto each valve guide.
• Oil the stem hole of each valve guide and drive the guide
into the guide hole using the special tool.
09916-44910: Valve guide remover/installer
A CAUTION
Be sure to use a new valve guide ring and valve guide.