Float Chamber Fuel Level; Jet Centralising - Triumph Spitfire MK3 Handbook

RUNNING ADJUSTMENTS
Float Chamber Fuel Level (Fig. 107)
The level of fuel in the float chamber is adjusted by setting
the float lever on the float chamber lid, as follows :-
Disconnect the fuel feed pipe and remove the float chamber
lid.
Invert the lid and, with the float lever resting on the needle
valve, measure the gap between the lever and lower lid face as
shown.
If necessary, bend the float lever to obtain the correct setting.
Refit the float chamber lid, and re-connect the fuel pipe.
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Jet Centralising (Figs. 105 and 106)
If the suction piston is lifted and released, it should fall freely
and hit the inside "jet bridge" with a soft metallic click when the
jet adjusting nut (3) is screwed to its topmost position.
If a click is audible only when the jet is in the fully lowered
position, the jet should be centralised as follows:-
Disconnect the rod between the jet lever and jet head
(6, Fig. 105).
Holding the jet (4) in its upper position, slacken the gland nut
(7, Fig. 102) and move the jet assembly laterally until the jet is
concentric with the needle, then tighten the gland nut. The piston
should now fall freely and hit the jet bridge with a soft metallic
click.
Lower the jet and again lift and release the piston, noting any
difference in the sound of impact. If a sharper impact sound
results, repeat the centralising operation to achieve identical
sounds with the jet raised and lowered.
Re-connect the jet lever (6), replenish the dampers and tune
the carburettors before replacing the air cleaners.