Yamaha TT600RE (2004) [230/382] Inspection and repair

INSPECTION AND REPAIR

5-26

ENG

5. Emery:

•

Valve seal surface

•

Valve seat

NOTE:

If the valve seat is renewed or the valve and guide

replaced, the valve seat and seal surface must be

lapped.

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Lapping steps:

•

Apply rough-lapping compound to the valve

seal surface.

Make sure the lapping compound does not

run into the space between the guide and

valve stem.

CAUTION:

•

Apply oil to the molybdenum disulfide on the

valve stem.

•

Install the valve in the cylinder head.

•

Turn the valve until face and surface are not

evenly polished. Then clean away all the lap-

ping compound.

NOTE:

For best results, during lapping, repeatedly apply

(light) pressure to the valve seat, turning the valve

backwards and forwards by hand.

•

Apply a fine-lapping compound on the valve

seal surface and repeat the procedures

described above.

NOTE:

Be sure to remove all the lapping compound from

the valve surface after every lapping operation.