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Power Unit
25) Installation of Valve
Install the valve spring seat 1 and new valve stem seal 2
1.
onto the valve guide.
• Apply 4-stroke engine oil to the valve spring
seat and valve stem seal.
• Install the gray valve stem seal on the air intake
side and the green valve stem seal on the
exhaust side.
Install the valve 3, valve spring 4, and retainer 5 in the
2.
order shown in the diagram, then install the valve spring
compressor 6.
Valve Spring Compressor 6:
Commercially available item
• Use an attachment of 16.5 mm (0.650 in).
• Apply 4-stroke engine oil to the valve stem area,
valve spring, retainer, and cotter 7. (No oil
should be adhered to the valve bevel.)
• When installing the valve spring, the side with
the white paint (roughly wound side) should
be facing upward (retainer side). (The side
with the narrower spring pitch should be facing
downward)
3.
With the valve spring compressed, use a narrow flathead
screwdriver with a small amount of grease at the tip to
install the cotter.
4.
Tap the retainer lightly with a plastic hammer to fasten the
cotter securely.
5-60
6
7
5
4
3
4st 25/30 2022
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