IGNITION TIMING
The ignition contact breaker
is
in
the timing cover
on
the right of the
motor, and
is
driven by the exhaust camshaft. There is a round chromium
p'lated cover
over
it held by two screws. To remove the timing cover,
fo
r
instance to examine the oil pump, the contact breaker (cam and auto-
advance assembly) must be released from the
camshaft, To release the
contact breaker remove the central bolt and use extractor tool
0782 by
screwing it into the end of the hollow spindle.
When
replacing the contact breaker it must be positioned correctly
relative to the exhaust camshaft. A pin
is
provided
in
the exhaust
camshaft
and a slot
in
the taper end of the auto advance spindle serves
as a location.
For timing purposes two alternative methods have been used for setting
the engine
in
the
38(
' fully advanced position. The first utilises service tool
02195
and
0572
. By turning the engine over gently with the service tool
fitted
in place of the blanking plug at the top rear
of
the right hand crank-
case, slight hand pressure on the plunger will enable this
to
locate with a
slot cut into the flywheel for this purpose.
The.re
are two slots in the flywheel. one at 38" and one
at
top dead centre
(T.O.C.). When timing as above check with a sparking plug removed that
the pistons are not at
T.D.C. which would indicate the wrong slot being
rocated. The T.D.C. plug is for degree plate use only.
8
1. BLACK/YELLOW WIRE
2.
PILLAR BOLT
3.
SECONDARY BACK
PLA
TE
LOCKING SCREW
5.
SECONDARY BACK PLATE
ECCENTRIC SCREW
6. CONTACT LOCKING SCREW
7 . CONTACT LOCKING SCREW
8. LUBRICATING WICK
Fig. 8. Contact breaker unit
28
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