Suzuki TU250X Service Manual page 75

3-28 ENGINE
VALVE FACE WEAR
The thickness of the valve face decreases as the face wears.
Visually inspect each valve face for wear and replace any valve
with an abnormally worn face. Measure the valve face thickness
T, if it is out of specification, replace the valve with a new one.
 Valve head thickness T
Service Limit (IN. & EX.): 0.5 mm (0.02 in)
 09900-20101: Venier calipers (150 mm)
VALVE STEM RUNOUT
Support the valve using V blocks, as shown, and measure its
runout with the dial gauge. If the runout exceeds the limit,
replace the valve.
 Valve stem runout
Service Limit (IN. & EX.): 0.05 mm (0.002 in)
 09900-20607: Dial gauge
09900-20701: Dial gauge chuck
09900-21304: V blocks
VALVE HEAD RADIAL RUNOUT
Place the dial gauge at a right angle to the valve head face and
measure the valve head radial runout.
If it measures more than the service limit, replace the valve.
 Valve head radial runout
Service Limit (IN. & EX.): 0.03 mm (0.001 in)
 09900-20607: Dial gauge
09900-20701: Dial gauge chuck
09900-21304: V blocks
VALVE STEM DEFLECTION
Lift the valve about 10 mm (0.4 in) from the valve seat. Measure
the valve stem deflection in two directions, "X" and "Y", perpen-
dicular to each other. Position the dial gauge as shown. If the
deflection exceeds the service limit, then determine whether the
valve or the guide should be replaced with a new one.
 Valve stem deflection
Service Limit (IN. & EX.): 0.35 mm (0.014 in)
 09900-20607: Dial gauge
09900-20701: Dial gauge chuck
X
Y