Yamaha Scorpio - Valves and Valve Springs Installation

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ENG
VALVES AND VALVE SPRINGS
●
Install the valve into the cylinder head.
●
Turn the valve unit the valve face and valve
seat are evenly polished, then clean off all
compound.
NOTE:
For best lapping results, lightly tap the valve
seat while rotating the valve back and forth
between your hand.
●
Apply a fine lapping compound to the valve
face and repeat the above steps.
NOTE:
Make sure to clean off all compound from the
valve face and valve seat after every lapping
operation.
●
Apply Mechanic’s blueing dye (Dykem)
b
to
the valve face.
●
Install the valve into the cylinder head.
●
Press the valve through the valve guide and
onto the valve seat to make a clean pattern.
●
Measure the valve seat width
c
again.
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EB404032
VALVES AND VALVE SPRINGS
INSTALLATION
1.Deburr:
●
Valve stem end
Use an oil stone to smooth the stem end.
2.Apply:
●
Molybdenum disulfide oil
(onto the valve stem
3
and seal
2
)
3.Install:
●
Lower spring seat
1
●
Oil seal
2
●
Valve
3
(into the cylinder head)
●
Inner valve spring
4
●
Outer valve spring
5
●
Upper spring seat
6
NOTE:
Install the valve spring with the larger pitch
a
facing upwards.
b
Smaller pitch
Molybdenum disulfide oil
New