HYOSUNG ST7 Owner's Manual page 63

getting into the engine. Change the
spark plugs if it shows cracks on the
insulating material, corroded electrodes
or excessive deposits.
5. Check the electrode gap with a thickness
gauge. The gap must be 0.7 ~ 0.8 mm
(0.028 ~ 0.032 in) if necessary, adjust it.
6. Make sure that the washer is in good
condition. Fit the washer and screw the
spark plug finger-tight to avoid damaging
the thread.
7. Tighten using the spanner supplied with
the tool kit. Screw in each spark plug by
one half turn to compress the washer.
TIGHTENING TORQUE
SPARK PLUG
PLUG REPLACEMENT GUIDE
Hotter type
Standard type
Colder type
11 N m
(1.1 kgf m)
CR7E
CR8E
CR9E
The spark plug must be tightened firmly,
otherwise the engine may overheat and
severe damage may occur.
Use recommended spark plugs only.
A spark plug of the wrong rating may
shorten engine life and cause loss of
performance.
8. Fit the spark plugs cap properly, to pre-
vent it coming off due to engine vibration.
62
CAUTION