"CRUSADER
250," "250
CLIPPER"
AND
"CRUSADER
SPORTS"
Earlier Models
:-
"250 Clipper"
and
"Crusader
250"-
(
Exhaust opens
75
° before B.D.C.
Exhaust closes 30° after T.D.C.
Inlet opens 45° before T.D.C.
Inlet closes 65° after B.D.C.
These points are all given
at
·015" valve clearance
and it
is
important that this clearance should be used
when checking, as the first part of the valve lift
is
com-
paratively slow and a small variation in clearance
considerably alters the opening and closing points. For
running, set to the clearances given in Section 28.
"Crusader Sports." There should be a running
valve clearance
of
approximately ·005° to .008°
and
the
valve timing with this clearance should
be:-
Exhaust opens
75
° before B.D.C.
Exhaust closes
50
° after T.D.C.
Inlet opens
50
° before T.D.C.
Inlet closes
75
° after B.D.C.
33 Ignition Timing. The contact breaker
is
accessible
after removing the small circular cover
at
the front
of
the off-side crankcase cover. Owing to the provision
of
automatic ignition advance, ·the contact breaker
is
always
fully retarded when the engine
is
at
rest
or
is
being turned ·
over slowly.' The advance mechanism
is
situated behind
the contact breaker and gives a range
of
approximately
12t
0
on
the half-speed shaft, corresponding to
25
° on
the engine shaft.
The optimum ignition timing
is
30° advance (7 /
32"
before T.D.C.) so
that
in the fully retarded position the
contact· points must be open when the piston is 5°
or
about 1/64" before T.D.C.
To time the ignition, proceed as follows
:-
Switch off
and
check the maximum opening
of
the
points, which must be ·014" to ·016".
23
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