'61HN252' by American Honda Motor Co. - Page 176 of 540
http://services.honda.com/ServiceManual/SVC_MNL/61HN253/61HN2...
1 of 1
3/9/2008 10:50 PM
[2005-2008] [TRX500 FA/FGA]
CYLINDER HEAD/VALVE/CAMSHAFT
REFACING
· Follow the refacer manufacturer's operating
instructions.
· Be careful not to grind the seat more than neces-
sary.
45°
60°
32°
If the contact area is too high on the valve, the seat
CONTACT TOO HIGH
must be lowered using a 32° flat cutter.
If the contact area is too low on the valve, the seat
must be raised using a 60° interior cutter.
32°
CONTACT TOO LOW
60°
Using a 45° seat cutter, remove any roughness or
irregularities from the seat.
ROUGHNESS
TOOLS:
Valve seat cutter, 35 mm (IN) 07780-0010400
Valve seat cutter, 33 mm (EX) 07780-0010800
Cutter holder, 5.5 mm
07781-0010101
or equivalent commercially available in U.S.A.
Using a 32° flat cutter, remove 1/4 of the existing
valve seat material.
TOOLS:
OLD SEAT WIDTH
Flat cutter, 36 mm (IN)
07780-0013500
Flat cutter, 33 mm (EX)
07780-0012900
Cutter holder, 5.5 mm
07781-0010101
or equivalent commercially available in U.S.A.
32°
8-14
