Pulser And Charging Coils Test - Yamaha SRX440 1980 Service Manual

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