AJS 350 1954, Maintenance Manual And Instruction Book, Page: 77 / 96

ELECTRICAL SERVICE
IGNITION
A Lucas magneto type N1-4 with manual advance and retard is fitted to 350 c.c. Touring
models,
A Lucas magneto type SR-1 with automatic advance and retard is fitted to 500 c.c.
Touring models.
A Lucas racing magneto type NR-1 is fitted to all Competition 350 c.c. and 500 c.c.
models.
The only service attention required by the N1-4 magneto is the occasional lubrication of
the contact breaker cam and tappet and infrequent adjustment of the contact breaker
points. To lubricate the contact breaker cam and tappet it is necessary to remove the
complete contact breaker.
To remove contact breaker (Magneto type N1-4)
Swing away the flat blade retaining contact breaker cover and remove same. Remove
the screw E (Illustration 20) retaining the spring arm A to the contact breaker body and
take away the backing spring F (Illustration 29) and also the spring arm E. Note there
is a spring washer under the screw. Unscrew screw B (Illustration 28) carrying the
lubrication wick and take away the fibre insulating bush encircling the screw. Straighten
the tab on the lock washer D (Illustration 29) under the central screw H retaining the
contact breaker body A to the armature shaft and with spanner 017251 remove the
central screw. Finally lever off the contact breaker.
To lubricate contact breaker cam and tappet (Magneto type N1-4) remove the contact
breaker as described.
Saturate with a few drops of thin machine oil the wick mounted in the core of its
carrying screw B (Illustration 28). Push out of the contact breaker body the tappet B
(Illustration 29), wipe it with a soft cloth, smear it with thin machine oil, clean and
replace.
NOTE—When replacing the contact breaker parts ensure the backing spring F
(Illustration 29) is fitted so that its bent over end faces outwards.
Illustration 28
Showing Contact Breaker
CONTACTS
L O C K NUT
CONTACT BREAKER
SECURING SCREW
SCREW CARRYING
LUBRICATION WICK
SCREW SECURING
CONTACT BREAKER
BACKING
S P R I N G
SPRING
A R M
TAPPET
HOUSING
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