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4.
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Ignition and Lights
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Again the Icey may not be removed. This position
is used for night riding.
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The lock with keys is captive in the switch
body. If for any reason the lock need be replaced,
it can be removed from the switch body to which it
is held captive by a spring operatod plunger. A
sharp pointed implement | such as a ground-down
spoke wouid be ideal for depressing the plunger
through the hole in the side of the switch body.
Whilst depressing the plunger the | switch body
should be shakon and the lock ejected.
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SECTION J11
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TESTING IGNITION SYSTEM
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Testing Sequence for Ignition System
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Engine; will not start - difficult to start -
misfires.
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(a)
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Check battery.
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(b)
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Check main fuse (if fitted).
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(c)
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Check for spark at both spark plugs.
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(d)
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Ensure timing, contact breaker and spark plug
gaps are satisfactory.
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(e)
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Check capacitor by substitution.
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(f)
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Check wiring for loose connections.
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(g)
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Test Zener Diode and ignition system.
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(h)
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Where fitted, check ballast resistor for short
circuiting, when hot.
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Ignition System Tests
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(a)
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Connect D.C. voltmeter Black lead to C.B.
terminal of contact breaker and Red lead to earth.
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(b)
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Ensure contact points are open.
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(c)
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Switch on ignition. Voltmeter should indicate
battery volts.
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(d)
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Ignition still on, close contact points.
Voltmeter reading should fall to zero.
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Note: Repeat the test for each coil with its
appropriate contact set.
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CONCLUSION:
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No reading for test (c) may indicate faulty
ignition switch, open circuit primary winding,
broken lead, short circuit to earth on C.P,. Iead,
faulty capacitor or blown main fuse.
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Low reading indicates high resistance in the
primary circuit or across ignition switch contacts.
A reading for test (d) indicates voltage drop
across the contact points (dirty) or poor
distributor earth.
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SECTION J12
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IGNITION COILS
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The ignition coils whether of the 12 volt or 6
volt type consist of primary and secondary windings
wound concentrically about a laminated soft iron
core, the secondary windings being next to the
core.
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The primary winding usually consists of some 300
turns of enamel covered wire and the secondary some
17,000 - 26,000 turns of much finer wire - also
enamel covered. Each layer is paper insulated from
the next in both primary and secondary windings.
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When the contact breaker opens, causing a sudden
cut-off of current flow in the primary windings,
H.T. current is induced in the secondary windings
and a spark occurs at the spark plug.
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Note: The coils are of the oil filled type and
must be protected from mechanical damage which will
cause leakage.
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