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Yamaha F40B - Checking the Valve Seat

Yamaha F40B
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67C3K11 5-32
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3. Insert the special service tool 1 into the
camshaft end of a new valve guide 3,
and then strike the tool to drive the guide
into the cylinder head.
NOTE:
Apply engine oil to the surface of a new
valve guide 3 before installation.
Make sure that the circlip 4 contacts the
cylinder head.
4. Insert the special service tool 5 into the
valve guide 3, and then ream the guide.
NOTE:
Apply engine oil to the inner surface of the
valve guide before reaming it.
Turn the valve guide reamer clockwise to
ream the valve guide.
Do not turn the reamer counterclockwise
when removing it.
Be sure to clean the valve guide after ream-
ing it.
5. Measure the valve guide inside diameter.
Checking the valve seat
1. Eliminate carbon deposits from the valve.
2. Apply a thin, even layer of Mechanics
blueing dye (Dykem) onto the valve seat.
3. Press the valve lightly against the valve
seat with a valve lapper as shown.
Valve guide remover/installer 1:
90890-06801
Valve guide reamer 5: 90890-06804
S67C5082
E
3
1
4
S67C5083
3
5
E
Valve guide inside diameter:
Intake and exhaust:
5.5005.512 mm
(0.21650.2170 in)
S67C5084
Cylinder head

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