BSA Winged Wheel W1 Instruction Manual page 9

Starting.
First, turn on the petrol tap by pulling the knob
out. Then if the engine is cold (j.e. if it has not
nin for a few hours, and the temperature has there-
fore íallen to atmospheric level), it will proba,bly be
necessary to close the strangler in order to ensure
an easy start. To do this, press the triggor D,
Fig. 3, inwards irith the thumb and, holding it
thus, open throttle lever 4, by moving it in a.
clockwise direction to its fullest extelit. The
thumb may then be taken írom the trigger,
which will remain out of enga,gement until it is
allowed to ratchet back.
Release thc clutch by pulling up lever C, to
its íullest extent, in which position tho clutch
`rill be held out by the ratchet E`. Theli mount
the bicycle and pedal off in the normal manner.
When a suitabk. speed has been obtained, depress
the ratchet and gladuaily release the clutch lever.
This will couple the engine to the rear wheel and
cause the íormer to rotate, whereupon it should
immediately commence firing.
As sooii as the engine is running smoothly, which
should not ta.ke more than a secorid or so, ease the
throttle lever back slightly in order to release the
stra.ngler. The machine can then be ridden nor-
ma]ly a.s described iI] the next sectíon.
Drlving.
The speed of the engine and therefore of the
bicycle is controlled by the throttle lever and within
the limits of the performance of the B.S.A. Winged
Wheel it gives a uniíorm range of speed from a
walking pace with the throttle neaïly closed ríght
up to the maximum speed on the level amounting
to about 25 m.p.h. with corresponding lower speeds
on hills.
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Pedal assista.nce should never be riecessary on
the level except perhaps for starting, and aga.inst
a strong head wind, but it is expected that a smau
amount oí pedalling `rill be necessary occasionauy
on gra,dients, and the rider will rapidly learI} by
experience how best to a.ssist the engirie in this
resI)ex)t. The engine should never be auowed to
labour, and it will be íound that on quite severe
gra,dients the pedalling does not call for much
physical effort be¬ause it is only a matter of supply-
ing a little extra power above and beyond tha,t of
which the engine is ca,pable.
Any temptation to "drive on the brake," should
t)e avoided as it is obviously futile to have the
engine generating on one hand, amd íor that power
to be a.bsorbed on the other. When the occasion
arises for stopping or s]owing down, the throttle
should be closed and the clutch must be disengaged
before the brake is applied in order to avoid snatch
in the transmission.
Runnlng-in.
Running-in is really the most important period
in the liíe of the engine, and the handling you give
it during the early part of its liíe will determine,
what sort of service it is going to gíve you later.
If you try to put it through its pa,ces too soon
you will run the risk of seizure and other troubles
which may ha.ve a lasting eÍÏect on the engine, and,
iI` any case, until it is rea.1ly ruri-in it wil] not be
at its best. So give your engine a chance to settle
down during the first 250 miles of its life.
Avoid sudden and sharp acceleration. Do not
force it up hills, when a small amount of pedalling
would ea.se the load.
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