7. CYLINDER HEAD/VALVES
(90cc/70cc/50cc-4T)
7-13
ASSEMBLY
Install the valve spring seats and oil seal.
Lubricate each valve with engine oil and
insert the valves into the valve guides.
Install the valve springs and retainers.
Compress the valve springs using the valve
spring compressor, then install the valve
cotters.
Special tool
Valve Spring Compressor A120E00040
Tap the valve stems gently with a plastic
hammer for 2～3 times to firmly seat the
cotters.
INSTALLATION
Install the dowel pins and a new cylinder
head gasket.
Reverse the “CYLINDER HEAD
REMOVAL” procedures.
Torque:
Cylinder head bolt:
10 N-m (1 kgf-m, 7 lbf-ft)
Dowel Pins
Gaske
• When assembling, a valve spring
compressor must be used.
• Install the cotters with the pointed ends
facing down from the upper side of the
cylinder head.
＊
Be sure to install new oil seal.
＊
Be careful not to damage the valves.
＊
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