Suzuki LT-Z250 Service Manual page 68

3-26 ENGINE
VALVE STEM RUNOUT
Support the valve with the V-blocks and measure the valve stem
runout with the dial gauge, as shown. If the runout exceeds the
service limit, replace the valve with a new one.
% Valve stem runout
Service Limit: 0.05 mm (0.002 in)
& 09900-20701: Magnetic stand
09900-20607: Dial gauge (1/100 mm)
09900-21304: V-block
VALVE HEAD RADIAL RUNOUT
Support the valve with the V-blocks and measure the valve head
radial runout with the dial gauge, as shown. If the runout
exceeds the service limit, replace the valve with a new one.
% 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 FACE WEAR
Visually inspect each valve face for wear or damage. If any
abnormal wear is found, replace the respective valve with a new
one. Measure the valve head thickness T. If the valve head
thickness is not within the specified value, replace the value with
a new one.
% Valve head thickness T T T T
Service Limit: 0.5 mm (0.02 in)
& 09900-20101: Vernier calipers
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 exceeds the service limit, 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
X
Y