Yamaha TT600RE (2004) [227/382] Inspection and repair

ENG

INSPECTION AND REPAIR

5-23

2. Clean the valve surfaces of the carbon

deposits.

3. Inspect:

•

Valve seal surface

Pitting/Wear ➔ Grind the valve seal sur-

face.

4. Measure:

•

Edge thickness (a)

Out of specification ➔ Replace valve.

Edge thickness (a):

Intake: 1.0 ~ 1.4 mm

<Limit>: 0.8 mm

Exhaust: 0.8 ~ 1.2 mm

<Limit>: 0.65 mm

5. Check:

•

Valve stem tip

Deformed, mushroom-shaped or with a

higher diameter than the rest of the stem

➔ Replace valve.

•

Misalignment:

Out of specification ➔ Replace valve.

Stem offsetting:

<Limit>: 0.01 mm

NOTE:

•

Changing the valve, replace also the valve

guide.

•

Pulling the valve out, replace the stem seal.

VALVE SEAT

1. Clean the valve surface and seat of carbon

deposits.

2. Inspect:

•

Valve seat

Pitting/Wear ➔ Renew valve seat.