"CRUSADER
250," "250
CLIPPER"
AND
"CRUSADER
SPORTS"
(
l)
Water
in
Carburettor. The symptoms are usually
intermittent misfiring and banging in the silencer
following a heavy rainstorm.
The remedy
is
to clean out
th~
ftoat chamber and
jets.
(2)
No
clearance at tappets. This
is
apparent
by
an
entire lack of compression when turning over with
the kick starter. The remedy
is
to adjust the tappets.
(3)
Sticking Valve.
In
this case there
is
no compression
and excessive tappet clearance, the valve remaining
partly open. The valve may free itself on cooling,
but sometimes it
is
necessary to dismantle the engine
to free the valve.
(4)
Broken Valve. This trouble
is
very rare and
is
usually caused by consistent overdriving
of
the
machine and by neglect of the tappet clearance
(see
Section
28).
The symptoms are that the engine
" cuts out " suddenly and stops with no tappet clear-
ance. Furthermore,
it
is
not possible to obtain any
clearance at the tappets. A valve breakage on an
O.H.V. engine
is
likely to have very serious
consequences.
(5)
Seized Piston. This
is
caused by overdriving a
new
machine before the engine
is
properly " run in." The
symptoms are loss of power and a tendency to
"pink"
followed by the engine locking up solid. An
·aluminium piston will always free itself if allowed to
cool.
If
the clutch was withdrawn and the throttle
closed before the final seizure the consequences may
not be serious, but the cylinder and piston should
be
examined
as
soon as possible by a competent
mechanic to have any score marks removed. A
seizure may also occur through running with
insufficient oil, in which case the consequences
will
be
far more serious.
20
Clutch
Trouble.
A slipping clutch may
be
caused
by
Jack
of clearance in the control (see Section
39).
A binding clutch
is
caused by too much slack
in
the control wire. New clutches sometimes tend to bind
until the inserts have bedded down dead level.
16
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