Suzuki RM-Z250 Service Manual page 109

VALVE STEM WEAR
• If the valve stem is worn down to the limit, as measured with a
micrometer, replace the valve.
• If the stem is within the limit, then replace the guide.
• After replacing valve or guide, be sure to recheck the deflec-
tion.
 Valve stem O.D.:
Standard (IN.) : 4.475 – 4.490 mm (0.1762 – 0.1768 in)
(EX.): 4.455 – 4.470 mm (0.1754 – 0.1760 in)
 09900-20205: Micrometer (0 – 25 mm)
NOTE:
If valve guides have to be removed for replacement after
inspecting related parts, carry out the steps shown in valve
guide servicing.
VALVE GUIDE SERVICING
• Drive the valve guide out toward the intake or exhaust cam-
shaft side with the special tool.
 09916-43211: Valve guide remover&installer
NOTE:
* Discard the removed valve guide subassemblies.
* Only oversized valve guides are available as replacement
parts. (Part No. 11115-10H70)
• Re-finish the valve guide holes in cylinder head with the
reamer and handle.

When refinishing or removing the reamer from the
valve guide hole, always turn it clockwise.
 09916-33320: Valve guide reamer (9.8 mm)
09916-34542: Reamer handle
CYLINDER HEAD, CYLINDER AND PISTON 6-15