'61HN252' by American Honda Motor Co. - Page 177 of 540
http://services.honda.com/ServiceManual/SVC_MNL/61HN253/61HN2...
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3/9/2008 10:51 PM
[2005-2008] [TRX500 FA/FGA]
CYLINDER HEAD/VALVE/CAMSHAFT
Using a 60° interior cutter, remove 1/4 of the exist-
ing valve seat material.
OLD SEAT WIDTH
TOOLS:
Interior cutter, 34 mm (IN)
07780-0014700
Interior cutter, 30 mm (EX)
07780-0014000
Cutter holder, 5.5 mm
07781-0010101
or equivalent commercially available in U.S.A.
60°
Using a 45° seat cutter, cut the seat to the proper
width.
SEAT WIDTH
VALVE SEAT WIDTH:1.0-1.1 mm (0.039-0.043 in)
Make sure that all pitting and irregularities are
removed.
45°
After cutting the seat, apply lapping compound to
Excessive lapping
HAND-LAPPING TOOL
the valve face, and lap the valve using light pres-
pressure may
sure.
deform or damage
Change the angle of lapping tool frequently to pre-
the seat.
vent uneven seat wear.
After lapping, wash any residual compound off the
Do not allow
cylinder head and valve and recheck the seat con-
lapping compound
tact.
to enter the guides.
CAMSHAFT REMOVAL
Remove the cylinder head
(page 8-8).
SEALING WASHER
Remove the cam chain tensioner lifter sealing bolt
and sealing washer.
SEALING BOLT
8-15
