3-20 2002 Buell S3T: Engine
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Lapping Valve Faces and Seats
NOTE
If valve faces and seats have been smoothly and accurately
refaced, very little lapping will be required to complete the
seating operation.
1. See Figure 3-24. Use CYLINDER HEAD HOLDING FIX-
TURE (2) (Part No. HD-39786) to secure cylinder head.
a. Apply a light coat of fine lapping compound to valve
face. Insert valve in guide.
b. Place one rubber cup end of VALVE LAPPING TOOL
(1) (Part No. HD-96550-36A) onto head of valve.
c. Holding lapping tool as shown, apply only very light
pressure against valve head.
d. Rotate lapping tool and valve alternately clockwise
and counterclockwise a few times.
2. Lift valve and rotate it about 1/3 of a turn clockwise.
Repeat lapping procedure in Step 1.
3. Repeat Step 2. Then, remove valve.
4. Wash valve face and seat. Dry parts with a new, clean
cloth or towel.
5. Inspect valve and seat.
a. If inspection shows an unbroken lapped finish of uni-
form width around both valve and seat, valve is well
seated.
b. If lapped finish is not complete, further lapping (or
grinding and lapping) is necessary.
Figure 3-23. Measuring Valve Stem Protrusion
Figure 3-24. Lapping Valves
5696
5693
1. Valve Lapping Tool (Part No. HD-96550-36A)
2. Cylinder Head Holding Fixture
(Part No. HD-39786)
1
2
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