Suzuki Boulevard M50, Service Manual

Page: 78 / 454

3-32 ENGINE
VALVE HEAD RADIAL RUNOUT
Place the dial gauge at right angles to the valve head face, and
measure the valve head radial runout.
If it measures more than limit, replace the valve.

Valve head radial runout
Service Limit: 0.03 mm (0.001 in)

09900-20701: Magnetic stand
09900-20607: Dial gauge (1/100 mm)
09900-21304: V-block
VALVE STEM DEFLECTION
Lift the valve about 10 mm (0.39 in) from the valve seat. Mea-
sure the valve stem deflection in two directions, “X” and “Y”, per-
pendicular to each other, by positioning the dial gauge as
shown. If the deflection measured exceeds the limit, (see below)
then determine whether the valve or the guide should be
replaced with a new one.

Valve stem deflection (IN. & EX.)
Service Limit: 0.35 mm (0.14 in)

09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
VALVE STEM WEAR
If the valve stem is worn down to the limit, as measured with a
micrometer, where the clearance is found to be in excess of the
limit indicated replace the valve, if the stem is within the limit,
then replace the guide. After replacing valve or guide, be sure to
re-check the clearance.

Valve stem O.D.
Standard (IN.) : 5.475 – 5.490 mm (0.2156 – 0.2161 in)
(EX.) : 5.455 – 5.470 mm (0.2148 – 0.2154 in)

09900-20205: Micrometer (0 – 25 mm)
VALVE GUIDE SERVICING
• Using the valve guide remover, drive the valve guide out
toward the intake or exhaust rocker arm side.

09916-44910: Valve guide remover/installer
NOTE:
* Discard the removed valve guide subassemblies.
* Only oversized valve guides are available as replacement
parts. (Part No. 11115-38A71)
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