Honda SH125 Manual page 176

Lubricate the valve stem sliding surface with engine
oil.
Insert the valve into the guide while turning it
slowly to avoid damaging to the stem seal.
Install the valve spring with the tightly wound coils
facing the combustion chamber.
Install the spring retainer.
Toprevent loss of
Install the valve spring cotters using the valve
tension, do not
spring compressor.
compress the valve
springs more than
necessary.
Valve spring compressor 07757-0010000
Supportthecyh-
Tap the valve stems gently with two plastic ham-
der head so the
mers to seat the cotters firmly.
valve heads wi'lnot
Install the cylinder head (page 8-21).
contact anything
that cause damage.