Valve Seat Inspection/Refacing - Honda TRX70 Fourtrax 1986 Service Manual

CYLINDER HEADIVAlVES
Drive in the new valve guide from the top of the head .
Check to be sure the new guide was not damaged during in-
stallation, then ream the guide.
TOOL:
Valve guide driver. 5.5 mm
07742 - 0010100 or
07942-3290100
Ream the new valve guide after installation.
NOTE
Use cutting oil on the reamer during this operation.
Rotate the reamer in the same direction when inserting and
removing
it.
Rafsee the valva seat.
Clean the cylinder head thoroughly to remove any metal parti-
cles.
TOOL:
Valve guide reamer 07984 - 098000A
or
07984- 0980000 (U.S .A.
onlyl
VALVE SEAT INSPECTION/REFACING
Clean both intake and exhaust valves thoroughly to remove
carbon deposits. Apply a light coating of prussian blue to each
valve face. Lap each valve and seat using a rubber hose or
other hand· lapping tool.
NOTE
Take care not to allow the compound to enter between the
valve stem and guide .
After lapping, wash out the compound completely and
apply a coat of engine oil to the valve fa ce and saat.
Measure the w idth of the each valve face.
SERVICE LIMIT: 1.6 mm (0 .06 In)
CAUTION
The valves cannot be ground. If the valve fact! is rough, worn
unevenly, or contacts the seat improperly, the valve must be reo
placed.
6-8
(1)
VALVE GUIDE DRIVER
,
1