Yamaha VINO 125 Service Manual download pdf (Page 182)

ENG

5-21

3. Remove:

8valve cotter 1

8valve spring retainer 2

8valve spring 3

8valve stem seal 4

8lower spring seat 5

8valve 6

NOTE:

Identify the position of each part very carefully

so that it can be reinstalled in its original place.

VALVES AND VALVE SPRINGS

EAS00239

CHECKING THE VALVES AND VALVE

GUIDES

The following procedure applies to all of the

valves and valve guides.

1. Measure:

8valve-stem-to-valve-guide clearance

Valve-stem-to-valve-guide clearance =

Valve guide inside diameter a -

Valve stem diameter b

Out of specification J Replace the valve

guide.

Valve-stem-to-valve-guide clearance

Intake

0.010 ~ 0.037 mm(0.0004~0.0015 in)

<Limit>: 0.08 mm(0.003 in)

Exhaust

0.025 ~ 0.057 mm(0.001~0.002 in)

<Limit>: 0.10 mm(0.004 in)

2. Replace:

8valve guide

NOTE:

To ease valve guide removal and installation,

and to maintain the correct fit, heat the cylinder

head to 100°C (212°F) in an oven.

*****************************************************

a. Remove the valve guide with the valve guide

remover 1.

b. Install the new valve guide with the valve

guide installer 2 and valve guide remover

c. After installing the valve guide, bore the

valve guide with the valve guide reamer 3

to obtain the proper valve-stem-to-valve-

guide clearance.

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Yamaha VINO 125 Service Manual Page 182

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