YAMAHA TT600R Service Manual
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Brand: Yamaha
Category: Bicycle , Motorcycle
Type: Service manual
Model: Yamaha 2004 TT600RE , Yamaha TT600R
Pages: 380
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.