Royal Enfield 500 TWIN 1949 Workshop Maintenance Manual page 61

ROYAL ENFIELD WORKSHOP MANUAL
3. Replacing the Light Unit and Bulb
Slacken the securing screw at the top of the
headlamp rim. Remove the front rim and Light
Unit assembly.
Withdraw the adaptor from the Light Unit by
twisting it in an anti-clockwise direction and
pulling it off. Remove the bulb from its locating
sleeve at the rear of the reflector.
Disengage the Light Unit securing springs
from the rim and lift out the Light Unit.
Position the new unit in the rim so that the
word "TOP" on the lens is correctly located
when the assembly is mounted on the headlamp.
Refit the securing springs ensuring that they are
equally spaced around the rim.
Replace the bulb and adaptor. The bulb must
be the Lucas "prefocus" type, 6v. 30/24 watt
Lucas No. 312.
Locate the bottom of the Light Unit and front
rim assembly in the headlamp shell or in the
fixing rim attached to the Casquette fork head.
Press the front on and tighten the securing screw
at the top of the headlamp.
4. Parking Lights
In the case of lamps having separate shells the
parking bulb may be mounted either to show
through a hole in the back of the main reflector
(Fig. 1) or may be mounted in a separate housing
beneath the lamp shell (Fig. 2). In the case of
lamps fitted into a Casquette fork head twin
parking lights are provided. In all cases the bulb
is the same, i.e. 6v. 3 watt M.B.C. Lucas Part
No. 988.
Access to the parking bulb in the case of
lamps with separate shells is obtained by
removing the light unit as described in
Subsection 2. In the case of lamps in which the
parking bulb shows through a hole in the main
reflector the bulb holder assembly should be
removed. This will come away bringing with it
the parking bulb which will then be readily
accessible.
Section G5a Page 2
In the case of lamps having the underslung
parking light the parking bulb holder can be
lifted out of the lamp shell after removal of the
light unit.
In the case of lamps fitted into Casquette fork
heads access to the parking bulbs is obtained by
removing the parking lamp rim (see Fig. 4). This
may merely be forced over the edge of the
rubber lamp body or in the case of later
machines is additionally secured by means of a
small fixing screw. After removal of the lamp
rim, the parking lamp lens can be pulled out of
the rubber body, after which the bulb will be
accessible.
5. Tail Light
Earlier machines used a circular metal-bodied
tail light, either Lucas No. MT110 (Fig. 5) or
No. 480 (Fig. 6). In the former case, access to
the bulb is obtained by removing the back of the
lamp, which will come away bringing the bulb
with it. In the latter case, the front of the lamp is
removed, leaving the bulb carrier in position. In
either case the bulb is the same, that originally
fitted being 6 volt 3 watt S.B.C., Lucas Part No.
200, which, however, on machines of over 250
c.c. should now be replaced by 6 volt 6 watt
S.B.C. Lucas No. 205.