Valve Seat Refacing - Honda CB HORNET 160R 2015 Shop Manual

CYLINDER HEAD/VALVES
The valve can- • Contact area (too high or too low area)
not be ground-
– Reface the valve seat.
ed. If the valve
face is burned
or badly worn or
if it contacts the
seat unevenly,
replace the
valve.

VALVE SEAT REFACING

Valve Seat Cutters, a grinder or equivalent valve seat
Follow the
refacing equipment are recommended to correct a worn
refacing
valve seat.
manufacture's
operating
instructions.
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 inner cutter.
Reface the Use a 45 degree cutter to remove the roughness or
valve seat with irregularities from the seat.
a 45 degree
TOOLS:
cutter when a
Seat cutter, 27.5 mm (EX)
valve guide is
replaced.
Seat cutter, 29 mm (IN)
Cutter holder
7-16
07780-0010200
07780-0010300
07781-0010400
VALVE SEAT CUTTER
TOO LOW
32°
CONTACT TOO HIGH
CONTACT TOO LOW
TOO HIGH
45°
60°
OLD SEAT
WIDTH
32°
OLD SEAT
WIDTH
60°
ROUGHNESS