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BSA B31 - Engine Care and Maintenance; Running-in and Lubrication System

BSA B31
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slighlly
and open
the twist-grip a small
amounL Depr€ss
the kickstarter
ped4l
until comp.ession is felt,
nise the
crhaust valve lifter
and depress the kickstarter
fredal
a
little
more, Release the valve lifter.
allow the kickstarter
pedal
to
letum to the top of its
stoke aDd then
give
it a
vigorous
kick
downwards.
This starting
procedwe
should alwaF
be adopted as it
arllows the engine
to
gather
sumcient momentum
to over-
come the resistance
of the
next
compression
stloke,
Nore that while it is necessary
to close the ah levea
when
startiog from cold, this should
not
be
necessary
when the engine is walm.
During normal
ruoning th€ air lever should always
be kept fully
open, although a slight
gain
in
power
at
low speeds on hills
Eay sometimes be obtaiDed if the
levet is closed a very small
amount.
The ignition
lever should
be fully advanced for normal
running.
It may havc to be retarded slightly
if the engine is
under an inc.eased
load. The rrtanipulation
of this control
is largely a
matter of experience.
'lo
engl|ge Filst
Cear.
I)cprcss the clutch l€ver
(i.e.,
declutch),
and
move the
gcnr
change
trcdø,|
pwards
to its limit. ff difficulty is
cxpcrienccd when engaging fiIst
gear
when stationary, rock
the
rnachine backwards and
forwards mahtaining slight
pressure
on the
gcar
change
pedal
until
the
gear
is felt to
cngage.
To Molc Ofr.
Open the throttle slightly
aDd
gently
release the
clutch
lever. As the clutch engages,
open the throttle a little
turther, and when the clutch is
fully engaged the machine
cao be accelerated to a suitabte
road speed, ready
for
ohanging into the next
gear.
To
ChrIge
Gear
(Up).
Close tho throttle, disengage
the clutch and
prese
the
gea.
change
pedal
downwards to its limit,
all these
operatioN
being
p€rformed
simultaneously.
Engage
the
clutch and re-open the throttle
together, immediately after
changinS. lvot?.
Violent
pressure
on the
gpar
chango
pedal
is
neither ne.€ssary Dor desirable.
To Chstrg€ Gc{r
(Dortr).
Open
the
throtde slightly, disengage the clutch and
raise the
ge3r
changs
p€dal
upwards to its limit, all
these operations
being
performed
simultdFously.
Re.
cngage the clutch immediately.
Not?.-The above moverDelts zue
quito
easy to
pedotn
aDd a litde
practise
lrill ctEure a lapid atrd
quiet gear
change, When charging
gear,
either up
or
down,
it
i9
plgferable-aft€r
moving the
pedal-to
hold it
mom€n-
tarily
itr
position
with the
foot
unril after the
clutch
lever
has b€en released, when
the
gears
will b€
felt to
engage, Do not use aD excessive opening of the tbrottlc
when starting, and do not allow the engine to racE when
st4tionary. Usc the tbrottle cootrol to
govem
the sp€ed
of the Eachire, e,9., vhen descending a steep hi[, if a
lowet
gear
is eDgaged and the tbrottle closed,
the engift
will contol
the
speed of descent. Oo very
geasy
ro4d0
the use of the enSine
as a brake ii
to
be advocated,
particularly
in conjunction
with a change
to a lower
geaL
It is never advisable, except in
cases
of emergercy,
eitåer
to accelecate or to btake fierc€ly; when thc roadi
are
grcasy
both are extr€mely
dangerous.
TIINTS ON
'RTJNNING-IN '
A
NEW MOTOR CYCLE
The dder
who
has
just
purchased
a
new
machide will
do well
to remember that
all
the intemal
parts
are
just
as new as tho enamel atrd
plating
which can b€ se€q
aod that they must be well
"run-in"
befoæ the eogioo
ca.a be
given
aoy really hard wo*.
The
"ruDning-in"
process
is the most
important
pcriod
in the life
of
the
engine,
and
the
handling it
rccsiv€s
dudng the frst
1,000
to 1,500 miles
will
determine tho
service it will
provide
in retum.
It
is advisable not to exceed half tbrottle in any
gear.
Il
excessive
speeds aae used there is risk of
piston
seizuro
and
other
troubles,
and in
any ev€rt
until the
&achine
has been
"ruo-io"
it
caDnot
be
expected to
give
its
b€€t
perfonnance.
In
particular,
avoid
rapid
acc€leration,
cspecially when the edgine is not under load atrd do not
l0
u

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