350 G Stub fitting 1945-46 276AC/1A 15/16" 130 106 3 4 0.037
350 G Flange fitting 1946-54 276BL/1A 15/16" 130 106 3 4 0.037
G deluxe/350 Clipper 1955-57 276AC/1A 15/16" 130 106 3 4 0.037
500 J Stub fitting 1946-50 276BM/1A 15/16" 140 106 3 4 0.031
500 J Stub fitting 1946-48 276CB/1A 1" 150 106 3 4 0.031
500 J Flange fitting 1946-54 276CT/1A 1" 150 106 3 4 0.031
500 J2 Flange fitting 1949-55 276CZ/1A
Showing air valve
and throttle closed
Types 274, 275, 276 and 289
The type numbers are found
on the engine connection
Fig 2.
CARBURETTER WITH PILOT JET SYSTEM
Your carburetter may be vertical, inclined or horizontal, but diagrammatically this view applies
to all models, the variation being in the attachment to the engine and of the float chamber.
Fig. 2 above is the sectioned view of the standard Amal carburetter as shown on sheet 1,
figure 1. This is the standard design where the primary air to the main jet and the pilot jet
system comes in jointly through the main air intake, see figure 3, sheet 3. The type
numbers are 274, 275. 276 and 289.
An alternative design is made where the primary air to the main jet comes in through four
visible ports around the base of the mixing chamber, and where also the air supply to the
pilot jet system is separate. The type numbers of these carburetters are 74, 75, 76, and 89.
These tuning instructions apply to both the above designs.
TWO DESIGNS
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