Ignition Spark Gap; Cdi System Peak Voltage - Yamaha 40V Service Manual

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ELEC
IGNITION SYSTEM

IGNITION SPARK GAP

WARNING
While checking the spark be careful not to
touch any connection of lead wires of the
"Ignition spark gap tester".
When doing the spark test, take special
care not to allow leakage from the plug
cap which has been removed.
This check is likely to produce sparks, so
be sure that no flammable gas or fluid is
present.
1. Check:
Ignition spark gap
Out of specification → Replace.
Spark gap:
9 mm (0.35 in)
Checking steps:
Adjust the spark gap to specification
by turning the adjusting knob.
Spark gap tester:
YM-34487/90890-06754
Connect the spark plug cap to the
spark gap tester.
Remove the spark plugs from the
engine.
Crank the engine and check the sparks
from the ignition system through the
discharge window.

CDI SYSTEM PEAK VOLTAGE

WARNING
While taking CDI unit check be careful not
to touch any connection of lead wires of
the "Digital tester".
NOTE:
If there is no spark, or the spark is weak,
continue with the CDI test.
If a good spark is obtained, the problem is
not with the CDI system, but possibly the
spark plug or other component is defec-
tive.
8-10
E