Valves And Valve Springs; Removing The Valves; Checking The Valves And Valve Guides - Yamaha 2009 XP500Y TMAX Service Manual

EAS24280

REMOVING THE VALVES

The following procedure applies to all of the
valves and related components.
TIP
Before removing the internal parts of the cylinder
head (e.g., valves, valve springs, valve seats),
make sure the valves properly seal.
1. Remove:
• Valve lifter "1"
• Valve pad "2"
TIP
Make a note of the position of each valve lifter
and valve pad so that they can be reinstalled in
their original place.
2. 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 5-21.
M MMM M MMM M 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.
TIP
There should be no leakage at the valve seat "1".
L LLL L LLL L L LLL L L LLL L
3. Remove:
• Valve cotters "1"
M MMM M M MMM M MMM
L LLL L L LLL L LLL
5-19

VALVES AND VALVE SPRINGS

TIP
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
"2" and the valve spring compressor attachment
"3".
Valve spring compressor
90890-04019
YM-04019
Valve spring compressor attach-
ment
90890-04114
Valve spring compressor adapt-
er 19.5 mm
YM-04114
4. Remove:
• Upper spring seat "1"
• Valve spring "2"
• Valve "3"
• Valve stem seal "4"
• Lower spring seat "5"
TIP
Identify the position of each part very carefully so
that it can be reinstalled in its original place.
EAS24290
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of the
valves and valve guides.