Yamaha TT600RE (2004) [228/382] Inspection and repair

INSPECTION AND REPAIR

5-24

ENG

3. Measure:

•

Valve seat width (a)

Out of specification ➔ Renew valve seat.

Valve seat width (a):

Intake: 1.0 ~ 1.2 mm

<Limit>: 1.8 mm

Exhaust: 1.0 ~ 1.2 mm

<Limit>: 1.8 mm

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Measurement steps:

•

Apply Prussian blue (Dykem) to the valve

seat.

•

Install the valve in the cylinder head.

•

Press the valve onto the housing through the

guide to leave a clear outline.

•

Measure the width of the valve seat. Where

there is contatc between valve and seat the

Prussian blue is wiped away.

•

If the valve seat is too narrow, wide or off-cen-

tre, the valve seat must be renewed.

4. Renew:

•

Valve seat

Use the special tool (1) to renew the valve

seat with 30°, 45° and 60° mills.

Turning the cutter, maintain uniform pressure

(about 4-5 kg) to avoid leaving marks on the

valve seat.

CAUTION: