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Fig. 2-79.
ThroHle position
Thrott le position
Fully open throffle
at low o
ut
put
l. Primary
throffle
2.
Valve
3. Secondary t hroff
le
"A"=2.7-
4.3 mm
(.11-.17")
CLEAN ING THE FLOATCHAMBER
The floatchamber
is
removed by unscrewingth
e
f1
oat-
chambe
r plug (S, Fig.
2-70
and
the scre
ws
(1).
Glean
the
gasket surfaoe and titt a new
rubbe
r ring (4). Fit
the floartchamber w ith a newgasket.
FLOAT LEVEL
Beforechecking
the
float level,
remove the carburet-
tor, invert it and ta,ke oud'
the
f1.oar
k hamber.
The Hoat
,
1 S
removed by ca,refu'Uy
breakl
i ng
rthe
f10at
spindle
from the
bliidge.
The floart is firtted with
the
sloping side fO'cing away
from
the
cairburettor hous-
ing.
Art
,
t he
,
c orred Hoat .Ievel, the top poinrt on the float
should
lie
15-17
mm
(.59-.67")
and the rear
edge
9-13
mm
(.35-.51")
above the sealing surface (see
Fig.
2-80).
If the level is incorrect, adjust by bending
the tag at the f10at valve.
N.B.
Do not bend the
arm
between
t.he
f1oa,
t and
the
pin.
2:
36
Fig. 2-80. Float
level
A= 9-13 mm (.35- .51")
B =15-17 mm (.59-.67")
Yö!MP
Fig. 2-81.
Diap hragm
in
a ir valve
REPLAC ING THE DIAPHRAGM
l. Screw out the ·damper p iston.
Make line-up
marks
on the
suct
ion chamb
er cover and carburettor
housing. Remove the
'
s ea
l
p
lu g,
re lease the 'Screws
and rtake
off
the sucti'on
chamber cover. Remove
the
spring.
2. Pull
up the
air
va,lve
wi·
t h diaphragm.
Re move
the
diaphragm by unscrewing th
e
four
sarews. Clean
the air valve.
N.B. Observe due care that the metering needle
is not
bent or moved from
its
position.
3.
Fi,
t the new dia'phragm, see
Fig.
2-81.
The rubber
regi·
s ter
shoul,d fit into the valve groove.
4. Move the air valve down and fit in the rubber
register
as
shown
in Fig.
2-82.
Fit the
cover and
fil·1
w~th
damper oil.
5.
Plug-'
s eal the suction chamber
·
G over.
Fig. 2-82.
Diaphragm in
carburettor
housing
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