CYLINDER HEAD/VALVES
8-20
VALVE SEAT REFACING
Follow the refacing
manufacturer's
operating
instructions.
Valve seat cutters/grinders or equivalent valve seat
refacing equipment are recommended to correct
worn valve seats.
If the contact area is too high on the valve, the seat
must be lowered using a 32-degree flat cutter.
If the contact area is too low on the valve, the seat
must be raised using a 60-degree interior cutter.
Reface the seat
with a 45-degree
cutter whenever a
valve guide is
replaced.
Use a 45-degree cutter to remove any roughness or
irregularities from the seat.
Use a 32-degree cutter to remove the top 1/4 of the
existing valve seat material.
32
°
60
°
45
°
60
°
32
°
OLD SEAT WIDTH
OLD SEAT WIDTH
CONTACT TOO HIGH
CONTACT TOO LOW
TOOLS:
Seat cutter, 29 mm (IN)
07780-0010300
Seat cutter, 24 mm (EX)
07780-0010600
Cutter holder, 4.0 mm
07781-0010500 or
equivalent commer-
cially available
ROUGHNESS
TOOLS:
Flat cutter, 29 mm (IN)
07780-0013400
Flat cutter, 24 mm (EX)
07780-0012500
Cutter holder, 4.0 mm
07781-0010500 or
equivalent commer-
cially available
32
°
OLD SEAT WIDTH
Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys.
email: [email protected]