SECTION F3
Amal 10TT9 Carburetter
1. General Description
This carburetter comprises two main parts,
the mixing chamber and the float chamber. They
are held together by the jet holder, which houses
the main jet and the needle jet. Above these, and
inside the mixing chamber, is the choke adaptor
into which, from below, is screwed the jet choke
tube. Sliding in the mixing chamber and
surrounding the choke adaptor is the throttle
valve (No. 5) and into this is clipped the jet
needle by means of a sliding clip which will fit
into any one of seven grooves. A tapered spring
fits between the throttle valve and the mixing
chamber top, which is secured by a screwed ring
or cap.
At the side of the mixing chamber is a
projecting boss having a narrow slot towards its
lower end. Into the top of this boss a narrow
slide is fitted, spring controlled and connected,
through a cable, to the air lever on the
handlebar.
Screwed into the mixing chamber body just
below the inlet to the engine is the pilot jet
which is spring loaded and controls the slow
running idling speed.
The mixing chamber is mounted on the
cylinder head by a two-bolt flange and the air
intake tube is screwed to the outer face of the
mixing chamber. A spring clip embracing this
tube is used to lock the top cap in position.
Screwed into the base of the float chamber is
a base plug embodying a guide for the float. The
float operates a needle valve seating in the float
chamber top, which is secured to the float
chamber by two screws. A float tickler is
provided and a single banjo, connecting to the
petrol feed, is secured by a large banjo nut.
2. Dismantling the Carburetter
By unscrewing the top cap from the mixing
chamber, the top, spring, throttle slide and
needle may be withdrawn. To remove the needle
from the slide, pull the copper clip sideways
from the needle groove.
To gain access to the main jet, remove the
hexagon plug from beneath the float chamber
connection; the hexagon bodied main jet may
then be unscrewed. It fits into the jet holder,
which is screwed into the mixing chamber.
Unscrewing the jet holder releases the float
chamber and also gives access to the needle jet,
which is screwed into the top of the jet holder.
If you look up into the bottom of the mixing
chamber when the jet holder has been removed,
the jet choke tube will be seen. This is slotted to
facilitate its removal, which should not be
necessary, however, neither should it be
necessary to remove the choke adaptor, but if it
is removed, take note of the washer beneath it.
Take note, also, of the two washers, one above
and the other below the float chamber
connection to the mixing chamber.
To dismantle the float chamber (it is
assumed that the petrol feed connection has
been broken), remove the float chamber banjo
nut and the banjo, taking care of the washers on
either side of the banjo. Unscrew the two
hexagon headed screws which secure the float
chamber top and remove the latter. This will
release the float needle and give access to the
float in the float chamber. The float guide may
be removed by unscrewing it from below
3. Carburation
The “choke” or effective bore of the carburetter
is of great importance for maximum speed. The
design in this carburetter is such that the
maximum volume of air may flow through to
charge the cylinder, also causing the maximum
depression or suction on the jet to supply the
fuel and atomise it.
Needle Control to the Jet.
Perfect carburation
throughout the range of the opening of the
throttle means acceleration clean and snappy.
This is where the needle control plays its part;
you have a large main jet for power and for
cooling the engine, and unless it is controlled it
may give you a woolly rich mixture at small
throttle openings -bad for acceleration and plugs.
The needle reduces the flow of petrol above the
main jet, and being taper, it reduces it most at
small throttle openings, and as the throttle is
opened, so the taper allows a bigger flow until
the throttle is about three-quarters open, when
the needle ceases to have any effect, and the
main jet is fully in play.
The needle is attached to the throttle by a
clip, the clip embracing one of seven grooves.
This enables you to tune on the needle once you
have set the main jet for power, by lowering the
needle to get less petrol and vice versa
,
in its
relation to the throttle opening. The needle is
controlling the fuel flow in a needle jet, which
has an accurately made bore, and this screws
into the bolt that holds the float chamber to the
Section F3 Page 1
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Содержание CONSTELLATION 1958
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Страница 43: ...1961 SUPER METEOR w w w h i t c h c o c k s m o t o r c y c l e s c o m ...
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Страница 97: ...Section M6 Page 1 SECTION M6 Special Tools w w w h i t c h c o c k s m o t o r c y c l e s c o m ...
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