E. Ignition Coil
1. Coil spark gap test
a. Remove the ignition coil
from
the frame.
b. Connect the Electro Tester as shown.
c. Connect a
fully
charged battery
to
the
tester.
d.
Turn
on the spark gap switch, and in-
crease
the gap
until
misfire occurs.
nx1
63
001------+
...
Minimum
spark gap: 9 mm (0.35 in)
1. Battery 2. 6 mm (0.24 in)
Spark plug color
No.1
Good (Carburetor is
tuned
properly.)
No.2
Bad (Mixture is
too
rich.)
Replace main jet with one-step small one.
No.3
Bad (Mixture is
too
lean.)
Replace main jet with one-step larger one.
Bad (Due
to
too
lean a
mixture,
piston is
damaged or seized.)
No.4
Replace
the
piston and spark plug.
Tune
the
carburetor
again, starting
with
low-speed tuning.
Bad (Due
to
too
lean a mixture,
the
en-
gine
knocks.)
Check
the
piston for holes or seizure.
No.5
Check
the
cooling system, gasoline
octane
rating and ignition timing. After replacing
the
spark plug,
tune
the
carburetor
again,
starting with low-speed tuning.
Bad (Due to lean a mixture,
the
spark
plug
rnelts.)
Check
the
piston for holes or seizure.
No.6
Check
the
cooling system, gasoline
octane
rating and ignition timing. After replacing
the
spark plug
with
colder
type,
tune
the
carburetor
again starting with low-speed
,tuning.
----fIIo'-
Primary coil resistance
---.....
Secondary coil resistance
F. Spark Plu9
The Iife of a spark plug and its
condition
vary
according
to
the habits
of
the rider.
You
can
learn a great deal about the operating condi-
tion
of
an engine by studying the spark plug.
Examine the spark plug at each periodic
inspection, and replace
it
with
a suitable plug.
Ask
the
customer
how
long and
how
fast
he rides his snowmobile, and recommend a
hot, standard, or cold plug accordingly.
Encourage
your
customers
to
change the
spark plug regularily.
Their
snowmobiles
will
run better, and fuel consumption
will
remain
low.
Secondary coil
resistance
5.9
kn
± 20%
at 20°C (68°F)
Primary coil
resistance
1.0n
± 10%
at 20°C (68
0
F)
2. Coil winding resistance tests
Use a pocket tester to determine resist-
ance and
continuity
of
the
primary
and
secondary coil windings.
MITSUBISH
F6T411
Manufacturer
6-4
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