The second method necessituates removal of the circular plate
at
the
forward end of the primary chaincase. Through the aperture will
be
seen
the timing marking on the rotor casting and this
aligns with a pointer
on
the primary chaincase at the edge of the aperture. Placing the rotor
marking
in
line with the pointer again gives the 38° timing position.
Remove both sparking plugs to facilitate turning over the engine.
Set both
sets of contact breaker gaps.
(See page 35). Set the engine at 38
G
B.T.D,C. with the contact breaker cam turned clockwise
to
the
fully
advanced position. Check the left hand paints (Black and Yellow lead)
which should just be starting to open.
If
they are not, slacken oth the
pillar bolts and turn the contact breaker main backplate. Turn clockwise
if
the pOints open too early and vice versa. When correct lock up the back-
plate, remove the flywheel locating
pl
unger
If
used a
nd
turn the engine
over slowly
th
ro
ugh 360
0
i.e. one revolution. Set the engine again at
38
°
B.T.D.C. Check the cam
is
still at the fully advanced position and check
that the second set of contacts (Black and White lead)
are
just starting to
open.
If there is any discrepancy, slacken
the
secondary backplate top
and bottom screws (Fig.
8)
and using the eccentric adjuster screw move
th
e backplate to achieve
th
e correct opening poi
nt.
The timing
is
now correct. Re-Iubricate the felts with 3 drops of clean
engine oil and refit
the
cap.
SPARK PLUG
The spark plugs a
re
14mm thread x
3/
4
in reach. The standard grade is
Champi
on
N3.
It
may be advisable
to
consult your dealer before varying the grade of
plugs, as he will know local conditions and your type of use.
To remove a sparking plug use
the
box spanner and short tommy bar
provided
in
the toolkit. If the plug
is
difficult
to
unscrew, pour some
penetrating oil round the threads and allow
it
to
soak before continuing.
Every
3,000 miles remove the spark plugs and have them cleaned and
tested on a plug cleaning machine.
If there is no plug cleaning machine
available use a penknife or wire brush to remove carbon deposit.
Measu
re
the gap with feeler gauges ; the correct setting is 0.025in
(
0.
635 mm). To adjust the gap bend
th
e side electrode but never the
centre electrode. Every
10,000
mil
es fit new spark plugs.
When replacing the plug smear a
li
tt
le
graphite grease
ro
und the threads
an
d make sure
th
e j
Oin
t washer
is
in
good
co
ndition.
29
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