Yamaha VMX12HC (1995) [148/405] Inspection and repair

Yamaha VMX12HC (1995) [148/405] Inspection and repair
INSPECTION AND REPAIR
seat
is
too narrow and
is
located down
near the bottom edge o f the valve face
(see
diagram "d").
/
--
Desired Result
Valve Seat Cutter Set
to increase its width
45° cutter
Valve/Valve Seat Assembly Lapping
1.
Apply:
Coarse lapping compound (small amount)
disulfide oil
To
valve
face.
To
valve
stem.
2.
Position:
3.
Rotate:
In cylinder head.
Turn until valve and
valve
seat
are evenly
polished, then clean off all compound.
4.
Apply:
lapping compound (small amount)
To
valve face.
5.
Repeat steps
2
and
3.
NOTE:
Be sure t o clean off
all
compound from valve
face after every lapping operation.
6.
Inspect:
face
Not yet uniformly smooth Repeat proce
-
dure from step
1.
7.
Apply:
Mechanics bluing dye
To
valve face and
seat.
8.
Rotate:
9.
Inspect:
face
Dykem
Valve must make full
seat
contact indicated
by grey surface all around.
The
valve
face
where bluing was removed.
Faulty contact
Replace.
(See procedure below)
3-24

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