Yamaha YZF-R6 L 2000 Specifications download pdf (Page 51)

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4. Lap:

• valve face

• valve seat

NOTE:

After replacing the cylinder head or

replacing the valve and valve guide, the

valve seat and valve face should be

lapped.

a. Apply a coarse lapping compound

to the valve face.

CAUTION:

Do not let the lapping compound enter

the gap between the valve stem and the

valve guide.

b. Apply molybdenum disulfide oil onto

the valve stem.

c. Install the valve into the cylinder head.

d. Turn the valve until the valve face and

valve seat are evenly polished, then

clean off all of the lapping compound.

NOTE:

For the best lapping results, lightly tap

the valve seat while rotating the valve

back and forth between your hands.

e. Apply a fine lapping compound to the

valve face and repeat the above steps.

f. After every lapping procedure, be

sure to clean off all of the lapping

compound from the valve face and

valve seat.

g. Apply Mechanic’s blueing dye

(Dykem) onto the valve face.

h. Install the valve into the cylinder head.

i. Press the valve through the valve

guide and onto the valve seat to make

a clear impression.

j. Measure the valve seat width

again. If the valve seat width is out of

specification, reface and lap the valve

seat.

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Yamaha YZF-R6 L 2000 Specifications Page 51