Honda CB900F Service Manual page 212

Use a eO-degree cutter to remove the bottom 1/4 of
the old seat.
TOOLS:
Interior cutter, 24 mm
(SO' IN/EX)
Cutter holder, 4.5 mm
07780-0010S00
07781 -0010S00 or
equivalent commer-
cially available
CYLINDER HEAD/VALVES
A
OLD SEAT WIDTH
-,
~
- - - -- - - --'S{\
!
Using a
45 ~
seat cutter, cut the seat to the
proper width.
Make sure that all pitting and irregularities
are removed.
Refinish if necessary.
After cutting the seat, apply lapping compound to the
valve face, and lap the valve using light pressure.
I
NOTICE
I
Excessive lapping pressure may deform or damage
the seat.
Change the angle of lapping tool frequently to pre-
vent uneven seat wear.
Do not allow lapping compound to enter the guides.
~ /'
1.0 mm 10.04 in)
"
/
After lapping, wash all residual compound off the
cylinder head and valve.
8-19