Adjusting The Electrical Setting Of The Regulator; Adjusting The Electrical Setting Of The Cutout; Checking The Electrical Setting Of The Cutout - Royal Enfield 350 BULLET 1949 Workshop Maintenance Manual

ROYAL ENFIELD WORKSHOP MANUAL
With the ignition switch in the "OFF" position,
start the engine.
Slowly increase the speed of the engine until the
voltmeter needle "flicks" and then steadies. Note this
value and stop the engine.
If this value lies outside the limits given in para.
2(b), the regulator setting must be adjusted.
If the value is within the limits, examine the
cut-out as described in para 3(c).
(e) Adjusting the electrical setting of the
regulator
Adjustment of the regulator requires removal of
the control box cover. This is facilitated by removing
the control box from the machine and providing
temporary connections. Loosen the control box cover
securing clips by slackening the securing screws set
in the base of the control box, and lift off the cover.
It is important that regulator adjustments are
carried out with the control box supported in a
similar position to that on the machine.
Restart the engine.
Slacken the locknut of the regulator adjusting
screw (see Fig. 2) and turn the screw in a clockwise
direction to raise the setting or an anti-clockwise
direction to lower the setting. Turn the screw only a
fraction of a turn at a time and then tighten the
locknut. Repeat as above until the correct setting is
obtained.
Adjustment of regulator open-circuit voltage
should be completed within 30 seconds; otherwise
Section G3a Page 2
heating of the shunt winding will cause false settings
to be made.
Stop the engine.
Remake the original connections and replace the
cover. Ensure that the cover seats correctly on the
sealing washer.
N.B.-A dynamo run at high speed on open circuit
will build up a high voltage. Therefore, when
adjusting the regulator, do not run the engine up to
more than half throttle or a false setting will be made.
(d) Checking the electrical setting of the cutout
If the regulator is correctly set but the battery is
still not being charged, the cut-out may be out of
adjustment.
Replace the control box in the testing position,
remake the temporary connections and remove the
control box cover. Connect a voltmeter between
terminals "D" and "E."
Start the engine and slowly increase the speed
until the cut-out contacts close. Note the voltage at
which this occurs and stop the engine. This should
be 6.3-6.7 volts. If operation of the cut-out takes
place outside these limits, it will be necessary to
adjust.
(e) Adjusting the electrical setting of the
cutout
Restart the engine.
Slacken the locknut securing the cut-out adjusting
screw and turn the adjusting screw in a clockwise
direction to raise the voltage setting or in an
anti-clockwise direction to reduce the setting.
Turn the screw only a fraction of a turn at a time
and then tighten the locknut. Test after each
adjustment by increasing the engine speed and noting
the voltmeter reading at the instant of contact closure.
Stop the engine.
Electrical setting of the cut-out, like the regulator,
must be made as quickly as possible because of
temperature-rise effects. Tighten the locknut after
making the adjustment.
N.B.-if the cut-out does not operate, there may be
an open-circuit in the wiring of the cut-out and
regulator unit, in which case the unit should be
removed for examination or replacement.