7-58
Cylinder head
0
1
2
3
4
5
6
7
8
9
10
A
3.
Insert the special service tool
d
into the
valve guide
c
, and then ream the valve
guide.
TIP:
• To ream the valve guide, turn the special
service tool
d
clockwise.
• When removing the special service tool
d
,
do not turn it counterclockwise.
• After reaming the valve guide, make sure to
clean it.
4.
Measure the valve guide inside diameter.
Checking the valve seat
1.
Remove carbon deposits from the valve.
2.
Apply a thin, even layer of Mechanic’s
blueing dye (Dykem) onto the valve seat.
3.
Push the valve lightly against the valve
seat using the special service tool
a
.
4.
Measure the valve seat contact width
a
where the blueing dye adhered to the
valve face. Reface the valve seat if the
valve is not seated properly or if the valve
seat contact width is out of specification.
Check the valve guide if the valve seat
contact width is uneven.
Valve guide remover/installer
b
:
90890-06801
Valve guide installation height
a
:
11.300–11.700 mm
(0.4449–0.4606 in)
Valve guide reamer
d
: 90890-06804
Valve guide inside diameter:
Intake and exhaust:
5.504–5.522 mm (0.2167–0.2174 in)
c
d
Valve lapper
a
: 90890-04101
Valve seat contact width
a
:
Intake:
1.100–1.400 mm (0.0433–0.0551 in)
Exhaust:
1.400–1.700 mm (0.0551–0.0669 in)
a
a
Summary of Contents for F225F
Page 1: ...SERVICE MANUAL 6CE 28197 3N 11 F L 225F F L 250D F L 300B ...
Page 4: ......
Page 54: ...1 31 SPEC Specification MEMO ...
Page 89: ...2 34 Lower unit 0 1 2 3 4 5 6 7 8 9 10 A MEMO ...
Page 263: ...6 28 Canister 0 1 2 3 4 5 6 7 8 9 10 A j k f b ...
Page 477: ...8 98 Shimming counter rotation model 0 1 2 3 4 5 6 7 8 9 10 A MEMO ...
Page 537: ...9 58 PTT cylinder 0 1 2 3 4 5 6 7 8 9 10 A MEMO ...
Page 562: ...A 1 MEMO ...
Page 565: ......
Page 566: ...May 2010 1 ABE E_1 YAMAHA MOTOR CO LTD ...
Page 576: ...A 13 ...