Honda CM400A - Valve Seat Inspection and Grinding

. .
HONDA
CYLINDER HEADIVALVE CB400T.
VALVE SEAT INSPECTION AND
GRINDING
Clean all intake and exhaust valves thoroughly
to remove carbon deposits.
Apply
a light coating of valve lapping com-
pound to each valve face. Lap each valve and
seat using a rubber hose or other hand-lapping
tool.
Remove the valve and inspect the face.
The valves cannot be ground. If the
valve face
is rough, worn unevenly, or
valve must be
re~laced.
Ins~ect the valve seats.
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).
NOTE
Follow the
refacer manufacturer operat-
ing instructions.
I
SEAT WIDTH
SERVICE LIMIT:
i
2.0 rnm (0.08 in.)
After cutting the seat, apply lapping com-
pound to valve face, and lap the valve using
light pressure.
After lapping, wash any residual compound
off the cylinder head and valve.
63. 5'
n
6-1 2
Date of Issue: January, 1978
O HONDA MOTOR CO., LTD.