Suzuki TU250X Service Manual page 76

VALVE STEM WEAR
Measure the valve stem O.D. using the micrometer. If it is out of
specification, replace 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. After replacing the valve or valve guide,
re-check the deflection.
 Valve stem O.D.
Standard: (IN.): 5.460 – 5.475 mm (0.2150 – 0.2156 in)
(EX.): 5.445 – 5.460 mm (0.2144 – 0.2150 in)
 09900-20205: Micrometer (0 – 25 mm)
NOTE:
If valve guides have to be replaced, refer to the valve guide ser-
vicing steps below.
VALVE GUIDE SERVICING
• Using the valve guide remover, drive the valve guide out
toward the camshaft side.
 09916-44910: Valve guide installer & remover
NOTE:
* Discard the removed valve guide subassemblies.
* Only oversized valve guides are available as replacement
parts.
• 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.
 09916-34542: Reamer handle
09916-34561: Valve guide reamer (11.3 mm)
ENGINE 3-29