Honda TRX400EX FOURTRAX 1999 Service Manual page 101

Using a 60" interior cutter, remove 114 of the existing
valve seat material.
TOOLS:
Interior cutter, 30 mm
Cutter holder, 5.5 mm
or equivalent commercially available
Using a 45" seat cutter, cut the seat to the proper
width.
-
WIDTH:
VALVE SEAT 1.0
Make sure that a l l pitting and irregularities are
removed.
After cutting the seat, apply lapping compound to the
valve face, and lap the valve using light pressure.
CAUTION
Excessive lapping pressure may deform or dam-
age the seat.
Change the angle of lapping tool frequently t o
prevent uneven seat wear.
Do n o t allow lapping compound t o enter the
guides.
After lapping, wash any residual compound off the
cylinder head and valve and recheck the seat contact.
07780-0014000
07781 -0010101
in U S A .
-
1.1 mm (0.039 0.043 in)
CYLINDER HEAD/VALVE
OLD SEAT WIDTH
1.0 - 1.1 mm
-
(0.039 0.043 in)
7-1 5