Honda TRX400EX FOURTRAX 1999, Service Manual

Page: 98 / 263

CYLINDER
VALVE GUIDE REPLACEMENT
Chill new valve guides in the freezer section of
a
refrigerator for about an hour.
Heat the cylinder head to 130 - 140°C (275
-
290°F)
with
a
hot plate or oven. Do not heat the cylinder
head beyond 150"
(300°F).
Use temperature indicator
sticks, available from welding supply stores, to be
sure the cylinder head is heated to the proper tem-
perature.
Wear heavy gloves to avoid burns when handling
the heated head.
CAUTION:
Using a torch to heat the cylinder head cause
Support the cylinder head and drive the valve guides
out of the cylinder head the combustion cham-
ber side.
TOOL
Valve guide driver, 5.5 mm 07742- 0010100
ALV RIVER
Install new O-rings onto the new valve guides.
Drive the new valve guides in the cylinder head from
the camshaft side while the cylinder head is still heated.
TOOL
Valve guide driver, 5.5 mm
Let the cylinder head cool to room temperature.
07742-0010100
Ream the new valve guides.
Insert the reamer from the combustion chamber side
of the head and always rotate the reamer clockwise.
TOOL
Valve guide reamer, 5.5
mm
07984
-
2000001 or
07984
-
only)
NOTE:
Take care not to tilt or lean the reamer in the guide
while reaming.
Use cutting oil on the reamer during this opera-
tion.
Clean the cylinder head thoroughly to remove any
metal particles after reaming and the valve
seat (page 7-14).
O-RING'
VALVE GUIDE REAMER'
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7-1
2