HYOSUNG GV125S Owner's Manual page 69

1. Disconnect spark plug caps.
2. Remove all the dirt from the
base of the spark plugs, then
unscrew it and extract it from
its seat, taking care that
neither dust
substances enter the cylinder.
3. Make sure that there are
neither carbon deposits,
nor corrosion marks on the
electrode and on the central
part: if necessary, clean
them with
cleaners for spark plugs, with
an iron wire and
brush.
4. Energetically blow some air,
in order to prevent the
removed
getting into
Change the spark plugs if it
shows cracks
insulating material, corroded
electrodes
deposits.
nor other
the special
/ or a metal
residues from
the engine.
on the
or excessive
0.7 ~ 0.8 mm
(0.028 ~ 0.032 in)
5. Check the electrode gap
with a thickness gauge. The
gap must be 0.7 ~ 0.8 mm
(0.028
necessary, adjust it.
6. Make sure that the washer
is in good condition. Fit the
washer and
spark plug finger-tight to
avoid damaging the thread.
7. Tighten using the spanner
sup- plied 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
— 66 —
~ 0.032 in)
screw the
15—20 N-m
(1.5—2.0 kgf-m)
CR7E
CR8E
CR9E
if