Valves And Valve Springs; Removing The Valves; Checking The Valves And Valve Guides - Yamaha MT-01 T 2005 Service Manual

EAS24280

REMOVING THE VALVES

The following procedure applies to all of the
valves and related components.
NOTE:
Before removing the internal parts of the cylinder
head (e.g., valves, valve springs, valve seats),
make sure the valves properly seal.
1. Check:
• Valve sealing
Leakage at the valve seat → Check the valve
face, valve seat, and valve seat width.
Refer to "CHECKING THE VALVE SEATS"
on page 5-37.
M MMM M MMM M M MMM M
a. Pour a clean solvent "a" into the intake and
exhaust ports.
b. Check that the valves properly seal.
NOTE:
There should be no leakage at the valve seat "1".
L LLL L LLL L L LLL L
2. Remove:
• Valve cotters
NOTE:
Remove the valve cotters by compressing the
valve springs with the valve spring compressor
set "1".
Valve spring compressor
90890-04019
YM-04019
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L

VALVES AND VALVE SPRINGS

3. Remove:
• Upper spring seat "1"
• Outer valve spring "2"
• Inner valve spring "3"
• Valve "4"
• Valve stem seal "5"
• Lower spring seat "6"
NOTE:
Identify the position of each part very carefully so
that it can be reinstalled in its original place.
MMM
EAS24290
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of the
valves and valve guides.
1. Measure:
• Valve-stem-to-valve-guide clearance
Out of specification → Replace the valve
guide.
• Valve-stem-to-valve-guide clearance =
LLL
Valve guide inside diameter "a" -
Valve stem diameter "b"
5-35
Valve-stem-to-valve-guide
clearance (intake)
0.010–0.037 mm (0.0004–0.0015
in)
Limit
0.080 mm (0.0032 in)
Valve-stem-to-valve-guide
clearance (exhaust)
0.025–0.052 mm (0.0010–0.0020
in)
Limit
0.100 mm (0.0039 in)