ROYAL ENFIELD WORKSHOP MANUAL
Section G2k Page 2
When no lights are in use the alternator output
is regulated to its minimum value by interaction of
the rotor flux and the flux set up by current flowing
in the short-circuited coils.
In the "Pilot" position these coils are
disconnected and the regulating fluxes are
consequently reduced. The alternator output
therefore increases and compensates for the
additional parking light load.
In the "Head" position the alternator output is
further increased by connecting all three pairs of
coils in parallel.
4. Emergency Starting
An emergency starting position is provided on
the ignition switch, for use if the battery has
become discharged and a normal start cannot
therefore be made. Under these conditions, the
alternator is connected direct to the ignition coil,
allowing the engine to be started independently of
the battery. It should be noted that with the
ignition switch at EMG and the engine running,
the battery receives a charging current, so that its
terminal voltage begins to rise. This rising voltage
opposes the alternator voltage, and, on single
cylinder machines in the event of a rider omitting
to return the ignition key to IGN after an
emergency start has been made, misfiring may
occur. This will cease on turning the ignition key
to the normal running position, IGN.
This system, which on a single cylinder
machine could cause trouble through unwanted
sparks on the compression stroke of the engine,
does not do so on the twin, owing to the fact that
the distributor permits the passage of a spark
only when the engine is near the firing position.
5. Direct Operation
Short journeys without the battery can be
made with the switch in the "EMG" position. To
do this, the cable normally connected to the
battery negative terminal must be connected to
an earthed point on the machine. If lights are
required when the battery is disconnected, use
only the headlights and keep the engine speed
low to prevent excessive voltage rise.
6. Routine Maintenance
The alternator and rectifier require no
maintenance apart from ensuring that all
connections are clean and tight.
If the rotor, stator, engine crankshaft or rear
half of the chaincase have been disturbed, the air
gap between the rotor and stator should be
checked. If a feeler gauge of at least .008 in. thick
cannot be passed between the rotor and each of
the stator poles the alignment should be checked.
If removal of the rotor becomes necessary for
any purpose, there is no necessity to fit keepers to
the rotor poles. When the rotor is removed wipe
off any metal swarf which may have been attracted
to the pole tips. Place the rotor in a clean place.
The nuts which clamp together the rectifier
plate assembly must not under any circumstances
be slackened. They have been carefully set during
manufacture to give correct rectifier performance.
A separate nut is used to secure the rectifier to the
frame of the motor cycle.
7. Ignition Coil Model Q6 or MA6
The ignition coil should be kept clean and the
terminals kept tight.
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Summary of Contents for 350 BULLET 1956
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