Valve Seat Inspection And Grinding - Honda CX500 1978 Shop Manual

NOTE
1
.
Follow the refacer manufacturer's
1
ing
operating instructions.
.
Inspect each cutting stone for cracks.
Reface the cutting stone to the correct
angle.
Each time a stone is removed and
reinstalled on the grinder, it must be
HONDA
CYLINDER HEADIVALVE
CX508
VALVE SEAT INSPECTION AND
. . . . . . . . .
,
7
GRINDING
Clean all intake and exhaust valves thoroughly
to remove carbon deposits.
Apply a light coating of valve lapping corn.
pound to each valve face. Lap each valve and
-~
seat
using a rubber hose or other hand-lapp
tool.
Remove the valve and inspect the face.
:.'
.. .
face is rough, worn unevenly, or contacts
the seat improperly, the valve must be
I
GRINDING ANGLES
!
Inspect each valve seat width.
STANDARD
:
1.1
-
1.3 mm
(0.04-0.05 in.)
SERVICE LIMIT : 2.0 mm (0.08 in.)
If the
seat
is too wide, too narrow or has low
spots, the seat must be ground. (A power
grinder is recommended for good valve
sealing.)
An even matt finish around the seat indicates
good valve contact.
\
I N K
.
IBL
, . I 3
IN : 29 mm I N : 32mm
EX: 26 mm EX: 29 mm
I
(0.04-0.05
in.)
WHITE
I N : 32mm
EX: 29.5 mm
6-10
Date of Issue: January, 1978
OHONDA MOTOR
CO., LTD.
I