Royal Enfield 350 BULLET 1956, Workshop Maintenance Manual

Page: 33 / 82

ROYAL ENFIELD WORKSHOP MANUAL
Section G1e Page 2
(b) Cleanings
(i) Occasionally remove the moulded cover
and wipe the inside of the cover with a soft dry
cloth. Clean the outside of the cover before
replacing it.
(ii) Examine the contact breaker. If the
contacts are burnt or dirty, clean them by
polishing with a very fine carborundurn stone or
fine emery cloth. The contacts may be cleaned
more easily if the moving contact assembly is
removed, as Sub-section 2 (a) (i).
(c) Adjusting Contact Breaker
After cleaning check the gap between the
contacts. Turn the engine until the contacts show
the maximum opening which should measure
0.010 in. to 0.012 in. If the setting is incorrect
slacken the two screws securing the fixed-contact
plate and move the plate until the correct gap is
obtained. Tighten the securing screws and
measure the gap again.
(d) Replacement of High Tension Cable
Use 7 mm. neoprene-covered rubber ignition
cable for the high tension lead. When connecting
a new cable to the magneto do not bare the cable
but cut it off flush to the required length. Remove
the moulded cover, slacken the cable retaining
screw and pull out the old cable. Push the new
cable fully home and secure by tightening the
screw. The pointed end of this will pierce the
insulation, make contact with the cable core and
lock the cable in place. After fitting a high tension
cable a continuity test should be made between
the cover electrode and plug end of the cable.
3. Servicing
To locate cause of misfiring or failure of
ignition, check as follows :
(i) Remove the sparking plug from the engine.
Hold the end of the high tension cable about 1/8
in. from the cylinder block and operate the
kickstarter. If strong and regular sparking is
produced the sparking plug should be cleaned
and adjusted.
(ii) If no sparking is produced, examine the
high tension cable and if necessary renew it as
described in Subsection 2 (d).
NOTE: In no circumstances must the
contact breaker cam be removed from or
turned on the spindle. The cam is correctly
positioned when the magneto is built and the
performance of the instrument depends on this
position being maintained
4. Automatic Advance Mechanism
This is automatically lubricated and requires
no attention beyond making sure that it operates
freely and the springs are securely fastened. For
timing instructions see Section C5, Subsection 4.
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