Valve Seat Refacing; Note - Honda 2000 XR50R Service Manual

CYLINDER HEAD/VALVES
VALVE SEAT REFACING
Valve seat cutters/grinders or equivalent valve seat
refacing equipment are recommended to correct
worn valve seats.
NOTE:
Follow the refacing manufacturer's operating in-
structions.
Refaee
the
seat Use a 45·dsgree cutter to remove any roughness or
wilha45-degree
irregularities from the seat.
cutler whenever a
valve guide
is
replaced.
7-10
Use a 32-degree (IN: 30°) cutter to remove the top
1/4
of
the existing valve seat material.
VALVE SEAT CUnERS (EQUIVALENT COM-
MERCIAl LYAVAILABLE IN U.S.A.)
IN: 07180 - 0012500 (24 mm/30·)
EX: 077S0 - 0012800 (21.5 mm/32°)
IN: 07780 - 0010600 (24 mm)
EX: 07780-001 1000 (20.5
mm)
IN, EX 07780 - 0014202 (22 mm)
ROUGHNESS
/
OLD SEAT WIDTH
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