HYOSUNG Aquil GV650, Service Manual

Page: 93 / 222

ENGINE 3-50
BOND
“
1215
”
◉ CYLINDER
●
Apply BOND
“
1215
”
to the parting line of crankcase.
◉
VALVE AND SPRING
● Insert the valve, with their stems coated with 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.
● Place the dowel pin ① and new gasket on the
crankcase.
●
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 kg ∙ m)
This cylinder is different from the front and rear.
Valve spring compressor : 09916-14510
Valve spring compressor attachment
: 09916-14520
●
Fit the cylinder head and tighten the six cylinder head
bolts diagonally.
Cylinder head bolt (M6)
: 8~12 N ∙ m (0.8~1.2 kg ∙ m)
Cylinder head bolt (M10)
: 40~45 N
∙
m (4.0~4.5 kg
∙
m)
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.
CAUTION
Make sure to replace the gasket with a new one.
MOLY PASTE
Head direction
Broad pitch part
Narrow pitch part
↓
↓
↓
↓
①