Cylinder Head - HYOSUNG 2010 ST7 Service Manual

CYLINDER
Apply BOND 1215 to the parting line of crankcase.
BOND 1215
Place the dowel pin ① and new gasket on the
crankcase.
CAUTION
Make sure to replace the gasket with a new one.
Apply the engine oil to the conrod small end, piston
and the piston rings.
Coat the cylinder wall with oil.
Install the cylinder and tighten the cylinder base nuts.
Cylinder base nut
: 7 ~ 11 N m (0.7 ~ 1.1 kgf m)
This cylinder is different from the front and rear.
VALVE AND SPRING
Insert the valve, with their stems coated with MOLY
PASTE.
MOLY PASTE
Apply the oil to the lip of the stem seal.
The narrow pitch side of each spring face to the head
when the valve spring install. The pitch of inside
spring and outside spring is changed. The pitch of
spring is decreased from the upper side to the lower
side.

CYLINDER HEAD

Put the valve spring and retainer and install the valve
cotter with compressed the spring by using the valve
spring compressor.
Valve spring compressor
Valve spring compressor attachment
CAUTION
After installing the valve cotter, tap the valve
stem end by using the plastic hammer at 2~3
times for assembly of the valve and cotter.
Fit the cylinder head and tighten the six cylinder head
bolts diagonally.
Cylinder head bolt (M6)
: 8 ~ 12 N m (0.8 ~ 1.2 kgf m)
Cylinder head bolt (M10)
: 40 ~ 45 N m (4.0 ~ 4.5 kgf m)
: 09916-14510
: 09916-14520
①
Broad pitch part
Narrow pitch part
ENGINE 3-52
Head direction