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
350 BULLET 1948-55 276CX/1A 1 140 106 3 4 0.037
350 BULLET 1956-58 376/29 1 180 106 3 3.1/2 0.25
350 BULLET 1959-62 376/215 1.1/16 190 106 3 4 30
350 BULLET TRIALS 1948-55 276EX/1A 15/16 140 106 3 4 0.037
350 BULLET AMERICAN 1960/61 389/57 1.3/16 260 106 3 4 30
350 BULLET WORKS REP 1958-61 376/29 1 180 106 3 3.1/2 0.25
500 BULLET 1953-55 289T/1A 1.1/8 180 106 2 3 0.037
500 BULLET 1956-58 389/9 1.1/8 200 106 2 3.1/2 30
500 BULLET BIGHEAD 1959-62 389/34 1.3/16 220 106 2 3.1/2 30
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