ENGINE
B
It
Is
advisable
to
wash Individual
parts
several times
in
a quantity of clean gasoline
(petrol)
to
ensure
absolute cleanliness. Allow
the
parts
to
dry
but
if
possible use a
Jet
of
compressed
air
from
s~,ch
as
a hand pump
or
air line
to
clear all holes and
drilllngs. Inspect
all
parts for
wear
and check
that
the
jets are
In
accordance
with
those
recommended
in
GENERAL DATA, page GD4.
Reassembly
Is
a reversal
of
the
aforegolng, referring
to
Fig.
B9,
for guidance.
During reassembly
fit
a new
"0"
ring
at
the
pilot
air
screw,
and
new fibre washers
In
replacement of
any which
may
have
deteriorated.
Be
careful to
locate both ends
of
the
float spindle
in
the float
chamber recesses provided and
note
that
the
float
needle
Is
assembled with its
pointed
end down-
wards.
When
the
mixing
chamber
body
Is
assembled
to the carburetor valve, air valve
and
carburetor
cap,
take
special care
that
the
locating peg
Is
lined
up
with
the
groove
in
the
body.
SECTION
810
INSPECTING
THE
CARBURETTER
COMPONENTS
The
only parts liable
to
show
wear
after
consider-
able mileage are
the
throttle
valve, mixing
chamber
and
the
air valve.
(1)
Inspect
the
throttle
valve
for
excessive scoring
to
the
front
area
and
check
the
extent
of
wear
on
the
rear
face.
If
wear
Is
apparent
the
valve
should be
renewed.
In
this
case,
be
sUre
to
re-
place
the
valve with
the
correct
degree
of
CUt-
away (see
"General
Data").
(2)
Examine
the
air valve
for
excessive
wear
and
check
that
It
Is
not
actually
worn
through
at
any part. Check
the
fit
of
the
air
valve
In
the
throttle
valve. Ensure
that
the
air
valve spring
Is
serviceable by inspecting
the
calls
for
wear.
(3)
Inspect
the
throttle
return
spring
for
efficlenty,
signs
of
cracking,
or
breakage
and loss
of
compressive
strength.
(4)
Check
the
needle Jet for
wear
or
po;slble
scoring and carefully
examine
the
tapered
end
of
the
needle for similar signs.
(S)
Examine
the
float needle for
wear
by
Inserting
It
Into
the
Inverted float
needle
seating blotk
pouring a small amOunt
of
gasoline (petrol)
Into
the
aperture
surrounding
the
needle and
checking It for leakage.
(6)
Ensure
that
the
fioat does
not
leak
by
shaking
It,
to
hear
Iflt
contains any fuel. Do
not
attempt
to
repair a damaged float. A
new
one
can
be
purchased for a small cost.
(7)
Check
the
fuel
petrol
filter, whR:h fits over
the
needle seating block, for any
pOSSible
damage
to
the
mesh. This would allow
the
gasoline
(petrol)
to
by-pass It un-filtered.
SECTION
811
RESETTING
THE
CARBURETTERS
The
carburetor
assembly
must
be
removed
from
the
machine
In
order
to
synchronise
the
throttle
slides.
Refer
to
Section
B8
for
the
removal
procedure.
SYNCHRONISING
THE
THROTTLE
VALVES
Remove the air filter
and
arrange the carburetor
and Inlet manifold assembly,
on
a
work
bench.
Examine
the
throttle
valves
through
the
engine
side
of
the carburetors, and
re-set
the
adjuster
screw (above each
carburetor)
until
the
valve on
one
carburetor
Is
open
approximately
0.010 Inche,.
Compare
the
other
twa
valves, and adjust
their
heights by screwing
the
Individual adjusters
clockwise
to
lower
the
valves, and
counter~c1ock
wise
to
raise
the
valves.
There
Is
a
locknut
on eath
adjuster, and this should be
tightened
when the
adjustment
Is
completed.
The difference
in
valve heights
is
easily visible (see
Fig.
B11).
B1S
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