Yamaha F6AMH, Service Manual

Page: 450 / 510

IGNITION SYSTEM
CHECKING THE SPARK PLUGS
Check:
Spark plugs
Refer to “CHECKING THE SPARK
PLUGS” on page 3-23.
CHECKING THE IGNITION SPARK GAP
WARNING
Do not touch any of the connections of
the spark gap tester lead wire.
Do not let sparks leak out of the removed
spark plug cap.
Keep flammable gas or liquids away,
since this test can produce spark
Check:
Ignition spark gap
Above specification
Replace the
spark plug.
Checking steps:
(1)Remove the spark plugs from the
engine.
(2)Connect a spark plug cap to the spark
gap tester.
(3)Set the spark gap length on the
adjusting knob.
(4)Crank the engine and observe the
spark through the discharge window of
the spark gap tester.
CHECKING THE SPARK PLUG CAPS
AND IGNITION COIL
1. Check:
Spark plug cap 1
High tension code
2
Ignition coil 3
Loosen connection Tighten.
Cracks/damage Replace.
Replacing steps:
(1)To remove the spark plug cap or high
tension code, turn it counterclockwise.
Ignition spark gap:
0.9 mm (0.04 in)
Spark gap tester:
YM-34487/90890-06754
8-10