Royal Enfield 350 BULLET 1949 Workshop Maintenance Manual Download

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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

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.

Section G3a Page 2

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