Buell XB 2010 Service Manual page 312

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PROCEDURE FOR USING THE NEWAY
VALVE SEAT CUTTER
PART NUMBER
B-35758-52A 7.02 MM VALVE SEAT CUTTER PILOT
HD-34751 VALVE GUIDE CLEANING BRUSH
HD-35758-C NEWAY VALVE SEAT CUTTER SET
HD-39786 CYLINDER HEAD HOLDING FIXTURE
sm00147
Figure 3-58. Neway Valve Seat Cutter
NOTES
Verify correct valve stem to valve guide clearance before
refacing. Refer to Table
installed, complete that task before refacing valves and
seats.
This procedure is not based on the lapping of valves. The
end result is an interference fit between the valve of 45°
and the valve seat which will be 46°.
1. Secure cylinder head for service.
a. Thread 12 mm end of CYLINDER HEAD HOLDING
FIXTURE (Part No. HD-39786) into cylinder head
spark plug hole.
b. Clamp tool in vise and further tighten cylinder head
onto the fixture to prevent any movement during
operation.
c. Place cylinder head at a 45° angle or one that offers
a comfortable working position.
2. Obtain the NEWAY VALVE SEAT CUTTER SET (Part
No. HD-35758-C) and cut valve seat angle to 46°. Do not
remove any more metal than is necessary to clean up the
seat (that is, to provide a uniform finish and remove pit-
ting).
3. In order to determine the correct location of the 46° valve
seat in the head, measure the diameter of the valve head
3-44 2010 XB Service: Engine
TOOL NAME
3-18. If new guides must be
to be used and subtract 0.080 in. (2.032 mm) from that
number.
4. Set your dial caliper to the lesser measurement and lock
down for quick reference. This is the location of your valve
seat.
5. Use a permanent magic marker to highlight the valve seat
area that is going to be cut and be sure to highlight all 3
angles. Allow marker to dry before proceeding.
NOTES
Always verify cutter blades and cutter pilot are clean before
beginning the cutting process. The correct cleaning brush
is supplied with the Neway tool set.
Also verify the inside of the valve guide is clean by using
VALVE GUIDE CLEANING BRUSH (Part No. HD-34751).
6. Install the valve seat cutter pilot, 7.02 MM VALVE SEAT
CUTTER PILOT (Part No. B-35758-52A), into the valve
guide hole and securely seat the pilot by pushing down
and turning using the installation tool supplied in the tool
set.
7. Choose the proper 46° cutter (intake or exhaust) and
gently slide the cutter onto the pilot being careful not to
drop the cutter onto the seat.
8. While applying a constant and consistent pressure, remove
just enough material to show a complete clean-up on the
46° angle.
NOTES
If the width of the clean-up angle is greater on one side
of the seat than the other, the guide may need to be
replaced due to improper installation.
After making the 46° cut, if you discover a groove cut
completely around the seat this means the blades of the
cutter are in alignment and need to be staggered. This is
accomplished by loosening all of the blades from the cutter
body and moving each blade slightly in it's cradle in
opposite directions on the cutter. The tool needed to
loosen the blades is supplied in the tool set. A permanent
magic marker mark every 90° will help in determining
where new angles are.
9. With your dial caliper locked to the predetermined setting,
measure the 46° cut at the outer most edge at the widest
point of the circle to determine what cut needs to be made
next.
a. If the 46° cut is too high (towards the combustion
chamber), use the 31° cutter to lower the valve seat
closer to the port.
b. If the 46° cut is too low, use the 60° cutter to raise the
valve seat or move it away from the port.
NOTES
Due to using the top measurement of our valve seat as a
reference point it will usually be necessary to use the 31°
cutter following the initial 46° cut.
Always highlight the valve seat with the permanent magic
marker in order to verify the location of the 46° valve seat.
10. If the location of the valve seat is not correct, repeat two
previous steps.