Yamaha 1100 Wartungshandbuch PDF herunterladen (Seite 71)

3-15

MEASURING THE COMPRESSION PRESSURE

INSP

ADJ

CAUTION:

WARNING

NOTE:

Before removing the spark plugs, use com-

pressed air to blow away any dirt accumu-

lated in the spark plug wells to prevent it

from falling into the cylinders.

5. Install:

 compression gauge

1

Compression gauge set:

90890-03081

6. Measure:

 compression pressure

Above the maximum pressure  Inspect the

cylinder head, valve surfaces, and piston

crown for carbon deposits.

Below the minimum pressure  Squirt a few

drops of oil into the affected cylinder and

measure again.

 Refer to the following table.

Compression pressure

(with oil applied in the cylinder)

Reading Diagnosis

Higher than

without oil

Piston wear or damage

 Repair.

Same as

without oil

Piston ring(-s), valves, cylin-

der head gasket or piston

possibly defective  Repair.

Compression pressure (at sea

level)

Standard:

1,000 kPa (10 kg/cm

2

, 10 bar)

Minimum:

900 kPa (9 kg/cm

2

, 9 bar)

Maximum:

1,100 kPa (11 kg/cm

2

, 11 bar)

a. Turn the main switch to “ON”.

b. With the throttle wide open, crank the engine

until the reading on the compression gauge

stabilized.

To prevent sparking, ground all spark plug

leads before cranking the engine.

The difference in compression pressure be-

tween cylinders should not exceed 100 kPa (1

kg/cm

2

, 1 bar).

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