BREAKER
POINTS
3.
(SEE INSET)
FIGURE
41.
MAGNETO IGNITION SYSTEM
measure resistance between leads. Resistance
should be about
11,000
ohms. If it is greater,
either the leads
or
magneto high tension coils
contain a high resistance or are open-circuited.
The magneto should be removed to test
resistances of the coil and leads separately.
Inspect the high tension terminals on the coil for
corrosion. If the resistance is low, the secondary
winding is probably shorted and the coil must be
replaced.
Check for shorting between primary and secon-
dary circuits by measuring resistance from
breaker lead to a spark plug lead. Any continuity
indicates a defective coil.
Flywheel
Magnets:
Permanent magnets mounted on
the flywheel provide a magnetic field for the magneto
coils. Never remove these magnets from the flywheel.
It may destroy their alignment and seriously weaken
the magnets.
A
piece of steel held close to the magnets must be
drawn strongly to them.
The magnets shouldn't lose strength with age
or
be
affected by dropping the flywheel.
If
the magnetism is
lost, return the flywheel to the factory for recharging.
Some flywheel magnet chargers can recharge the
magnets
in
the field, but makeshift equipment
wili
probably reduce the magnetism further.
To
recharge
the magnet
it
must have the-correct polarity. The
north-seeking end of a compass needle must be
attracted toward the leading magnet pole.
JC
IGNITION
SYSTEM
.The
JC
engine uses a battery ignition system with an
automotive distributor to produce and distribute
spark (Figure
42).
The system includes an ignition coil, adistributorwith
spark advance and breaker points, and spark plugs.
Maintenance:
Periodic maintenance of the system
should include oiling the distributor, cleaning and
adjusting the breaker points, checking ignition tim-
ing, cleaning and adjusting the spark plugs, and
inspecting the ignition system wiring.
At regular intervals, add
3
to
5
drops of medium
engine oil to the oiler on the distributor. Add
1
drop of
light engine oil to the breaker arm hinge pin and
3
to
5
drops to the felt in the top of the breaker cam and to
the governor weight pivots. Wipe grease lightly on
each lobe of the breaker arm. Don't over-lubricate the
distributor.
33
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by any means, is strictly prohibited.
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