Honda HS828 Manual page 59

4) Use the 30° - 32° and 60° cutters to narrow and adJust the
valve seat so that
it
contacts the middle of the valve face. The
30°- 32° cutter removes material from the top edge. The 60°
cutter removes material from the bottom edge. Be sure that the
Width of the finished valve seat is within specification.
• VALVE SEAT WIDTH
STANDARD
SERVICE LIMIT
0.8 mm (0 03 in)
2.0 mm (0.08 in)
5) Make a light pass with 45° cutter to remove any possible burrs
at the edges of the seat.
6) After resurfacing the seats, inspect for even valve seating.
Apply Prussian Blue compound or erasable felt-tipped marker
ink to the valve faces. Insert the valves, and then lift them and
snap them closed against their seats several times. Be sure the
valve does not rotate on the seat
The seating surface, as shown by the transferred marking
compound, should have good contact all the way around.
7) Lap the valves into their seats, using a hand valve tapper and
lapping compound (commercially available).
CAUTION:
To avoid severe engine damage, be sure to remove all
lapping compound from the engine before reassembly.
1
NOTE
~
--------------------·
Check valve clearance after reassembly.
HS928
HONDA
HSB2B
CONTACT TOO HIGH
~~
CONTACT TOO LOW
'T·~
O.Smm
(0.03 in)
]';VALVE LAPPER