Yamaha 440 Service Manual download pdf (Page 76)

1980 SRX440

will result in premature ignition or

power loss.

@) Bad (Piston holed or seized)

The metal shell end and insulator

show

signs

of

overheating. If mixture is too

lean. the piston can be holed or the

engine may tend to knock. As a result.

the spark plug will have occasional al-

uminum deposits,

® Bad (Knocking)

Generally. the spark plug

will

not

be

greatly affected by the strength of

mixtures. so long as the distance travel-

led is

not

long. But after long hours

of

driving. the insulator takes a greyish

black color due to aluminum deposits. If

so. the engine

will

fail to deliver full

power. and the piston could be holed or

seized. As a preventive measure. it is

recommended to use a higher octane

gasoline. adjust the ignition timing. en-

i

....

h +1-

+h

b. Clean the electrodes

of

carbon and ad-

just the electrode gap.

c. Besure to use the proper reach plug as

a replacement to avoid overheating.

fouling or piston damage.

Spark plug type: B-9ES (NGK)

Spark plug gap (use

wire

gap gauge):

0.7

~

0.8

mm

(0.028

~

0.031 in)

Spark plug torque:

28 Nm (2.8 m-kg)

G.

Pulser

and

charging

coil

test,

Check the resistance between terminals. If

resistance is

out

of

specification. coil is

broken. Check the coil connections. If the coil

connections are good. then the coil is broken

inside and it should be replaced.

,,~~

® Bad (Melting)

If the spark plug overheats. electrodes

will

met

away or the piston

will

be

holed.

2. Inspection

Instruct the rider to:

a. Inspect the clean the spark plug every

400

km

(250

mil

or

20

hours.

Charging coil resistance:

Brown to Red leads:

22511±10% at

20°C

(68°

F)

Pulser coil resistance:

White to Red leads:

1011±10% at

20°C

(68°F)

2

3

~-'I--(ll}

-CJ

1. Yellow

2. Brown

3. Black

4. White

5. Red

6. Flywheel magneto

7. Pockettester

8. Set tester at

"RX1"

position

7-6

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