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As the throttle is progressively opened the
mixture supply is augmented from the main jet which
discharges through the needle jet into the primary
air chamber and goes from there as a rich fuel/air
mixture through the primary air choke into the main
choke. The earlier stages of the throttle opening
are controlled by the throttle cut away and the
taper needle which passes through the needle jet,
the taper allowing more fuel to pass through the
needle jet as the throttle is opened.
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The Amal concentric carburetor is of the type
930 of 30 mm cross bore size on the Commando and
type 932 of 32 mm cross bore size on the Combat
high performance engine. A carburetor is shown in
exploded form with part descriptions in Fig. E1. A
common airbox serves both carburetors, this being
covered in detail in Section E10.
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SECTION E2
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CARBURETOR REMOVAL
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For ease of handling it is recommended that the
carburetors are removed attached to the spacers as
a pair as follows:
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1
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Disconnect the fuel lines from both fuel taps.
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2
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Remove four socket screws and washers securing
the spacers to the head - a shortened socket key is
needed for ease of access.
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3
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With the balance pipe and cables still
connected, lift the carburetors and manifolds away
from the cylinder head, disengaging the flexible
air hoses at the same time. To service the
carburetors individually:
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4
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Disconnect the balance pipe at one end.
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5
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Remove the two cross head screws and washers
securing the carburetor top.
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6
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Lift off the carburetor top, throttle and air
slides with cables attached.
The top and slides can be left hanging from the
cables but the exposed parts should be protected
from damage by wrapping in clean cloth.
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7
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If required, remove the second carburetor in
similar fashion, removing the fuel line by taking
off the banjo bolts.
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