HYOSUNG TE 450 Service Manual page 66

▣ ▣ VALVE STEM RUNOUT
Check the valve stem for abnormal wear or bend.
Support the valve using a V-blocks and measure the
valve stem runout using the dial gauge, as shown.
If the service limit is exceeded or abnormal condition
exists, replace the valve with a new one.
Cylinder head
Valve stem runout
distortion
Dial gauge : 09900-20606
Magnetic stand : 09900-20701
V-block : 09900-21304
▣ ▣ TAPPET & SHIM WEAR
When measuring the valve clearance, the clearance
should be within the standard range.
Valve clearance
Intake valve
Exhaust valve
● Inspect the tappet for wear and scratch.
If modification or scratch is present, replace the
tappet.
● When you checked the valve clearance, if the
valve clearance is wide please replace the present
shim into thick one, if the valve clearance is nar-
row please replace the present shim into thin
shim. (Refer to page 8-33∙34)
▣ ▣ SHIM KIND
There are 49 kinds of shim which thickness is increased
by each 0.025 mm from 2.30 mm to 3.50 mm.
Service limit
0.05 mm (0.002 in)
Standard (When cold)
0.1 ~ 0.2 mm
(0.004 ~ 0.008 in)
0.2 ~ 0.3 mm
(0.008 ~ 0.012 in)
ENGINE 3-24