Removing The Valves - Yamaha MIO Service Manual

VALVES AND VALVE SPRINGS
EASF0025

REMOVING THE VALVES

NOTE:
_
Prior to remove the valves, remove the cylin-
der head, rocker arms, and camshaft.
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. Check:
M
a. Pour a clean solvent a into the intake and
b. Check that the valves properly seal.
NOTE:
_
There should be no leakage at the valve seat
1.
L
2. Remove:
NOTE:
_
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
2.
4 - 24
• valve sealing
Leakage at the valve seat → Check the
valve face, valve seat, and valve seat width.
Refer to "CHECKING THE VALVE SEATS".
MMM M MMM M M MMM M M MMM
exhaust ports.
LLL L LLL L L LLL L L LLL
• valve cotters 1
Valve spring compressor
90890-01253
Valve spring compressor attach-
ment
90890-01243
ENG
M M MMM M M MMM M
L L LLL L L LLL L
MMM
LLL