3-28 ENGINE
After fitting all valve guides, re-finish their guiding bores with
the valve guide reamer. Be sure to clean and oil the guide
after reaming.
& 09916-34550: Valve guide reamer (5.5 mm)
09916-34542: Reamer handle
NOTE:
Insert the reamer from the combustion chamber and always turn
the reamer handle clockwise.
VALVE SEAT WIDTH
Coat the valve seat with prussian blue uniformly. Install the
valve and attach the valve lapper onto it. Tap the coated seat
with the valve face in a rotating manner, in order to obtain a
clear impression of the seating contact.
& 09916-10911: Valve lapper set
The ring-like dye impression left on the valve face must be
continuous, without any breaks. In addition, the width of the
dye ring, which is the valve seat width, must be within the fol-
lowing specification.
% Valve seat width
W
WW
W
Standard: 0.88 1.08 mm (0.035 0.043 in)
If the valve seat is out of specification, re-cut the seat.
VALVE SEAT SERVICE
The valve seats for intake and exhaust valves are machined to
two different angles. The seat contact surface is cut at 45.
& 09916-21111: Valve seat cutter set
09916-24900: Valve seat cutter set
09916-22480: Solid pilot (N-140-5.5)
09916-24450: Solid pilot (N-100-5.52)
09916-24935: Valve seat cutter (N-608)
'
INTAKE EXHAUST
15 N-212 N-121
45 N-608 N-122
The valve seat contact area must be inspected after
each cut.
Valve seat
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