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engule periormance if, indeed. it does not st0p the
engine altogether.
The piug should be cleaned and A
tested at regular intervals, and it is suggested that
this service be performed at your garage on a special
"Air Blast" service Emit.
If eventually the cleaning
process fails to restore the plug to its original crin-
dition of efficiency, it should be replaced by a. new
0118.
When inspecting a. plug, also check the gap be-
tween the points.
This should be .020-.022 in. and
adjustment should be made by bending the side
wire (Fig. 13)' Never attempt to move the
centre electrode. and it is always advisable to use
the special plug gap tool illustrated, obtainable at
2,-'- from any Champion Plug stockist or from the
Champion Sparking Plug Co. Ltd.. Feltham, Middle-
sex.
Feeler gauges are attached to verify correct
gap.
When refitting the plug, make sure that the
copper washer is not defective in any way.
If it
has become worn and flattened. fit a new one to
ensure obtaining a gasfight joint.
The Amal Carburetter.
The Amal carburetter fitted to the B.S.A.
WINGED WHEEL has been specially developed
{or this type of power unit.
In general it follows
the main principles embodied in the standard Amal
motor cycie carburetter. but it 3150 incdrporatu an
automatic strangler device A, Fig. 14, which comes
into operation when the throttle lever is opened
beyond its normal maximum as described in page
8 and 14.
This item calls for no maintenance
whatsoever. but if the throttle slide 3 is removed
for any reason care should be taken to ensure that
the small tongue at the lower end of the strangle:
A (not seen in. the illustration), engages properly
in the gmove C when re-assembling.
31
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