Yamaha Mio User Manual

4 - 24
ENG
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:
• valve sealing
Leakage at the valve seat
→
Check the
valve face, valve seat, and valve seat width.
Refer to “CHECKING THE VALVE SEATS”.
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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
.
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2. Remove:
• valve cotters
1
NOTE:
_
Remove the valve cotters by compressing the
valve spring with the valve spring compressor
2
.
Valve spring compressor
90890-01253
Valve spring compressor attach-
ment
90890-01243

Yamaha Mio Specifications

General

Brand	Yamaha
Model	Mio
Category	Scooter
Language	English