Valves And Valve Springs; Removing The Valves - Yamaha WR250R 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 cylin-
der head (e.g., valves, valve springs, valve
seats), make sure the valves properly seal.
1. Remove:
Valve lifter "1"
G
Valve pad "2"
G
NOTE:
Make a note of the position of each valve lifter
and valve pad so that they can be reinstalled in
their original place.
1
2. Check:
Valve sealing
G
Leakage at the valve seat → Check the valve
face, valve seat, and valve seat width.
Refer to "CHECKING THE VALVE SEATS"
on page 5-20.
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
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".
2

VALVES AND VALVE SPRINGS

LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
3. Remove:
Valve cotters "1"
G
NOTE:
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
"2".
Valve spring compressor
90890-04019
YM-04019
1
4. Remove:
Valve spring retainer "1"
G
Valve spring "2"
G
Valve "3"
G
Valve stem seal "4"
G
Valve spring seat "5"
G
NOTE:
Identify the position of each part very carefully
so that it can be reinstalled in its original place.
5-18
a
1
2