Amal Mk1 Concentric carburettor, front, flange mount Mk1 Concentric Range Amal logo Amal Mk1 Concentric carburettor, rear, flange mount

Introduced by Amal in 1967 & available today in 2 body sizes; 600 series (22,24,26mm) & 900 series (28,30,32mm). A set of three 27mm 600 series carbs is available for the Triumph/BSA triples. The float bowl is positioned concentrically underneath the slide offering improved fuel feed, even when inclined. Right & left hand versions are available in most sizes, changing the positions of the tickler button & adjustment screws. This range is available as a flange mount only, with 2" hole centres. Alcohol versions can be supplied for the 32 & 34mm sizes.

When ordering parts we will need to know the size of your carburettor. An identification number will be appear on the body e.g. 930, 626. The first digit is the series (900 or 600) the other numbers are the size (26mm, 30mm etc.). A letter "L" or "R" designates left or right hand. Carburettors are supplied jetted to suit the majority of applications. Separate jets & slides are available for fine tuning.

The information given below is intended as a guide only, final settings required may vary due to local fuels etc.
Triumph Part Number Size mm Main Jet Pilot Jet Slide No. Needle Pos. Needle Jet
T100C 1971-72 R626/300 26 170 N/A 4 2 106
T100R 1972 L626/301 & R626/300 26 150 N/A 3 1 106
TR61969-70 R930/300 30 230 N/A 3.5 2 106
T120 1968-70 L930/301 & R930/300 30 190 N/A 3 2 106
TR7V 1976-77 R930/300 30 270 N/A 3 2 106
T140 1976-77 L930/301 & R930/300 30 190 N/A 3 2 106
Norton
650/model 99 1967-68 L930/301 & R930/300 30 260 25 3 2 107
750 Atlas 1967-68 L930/301 & R930/300 30 220 25 2 2 106
Commando 1969, 1971-72 L930/301 & R930/300 30 220 N/A 3 2 106
Commando 850 MkIII 1975-77 L932/301 & R932/300 32 230 N/A 3.5 1 or 2 106
BSA
A65L 1968-69, A65F 1968 L930/301 & R930/300 30 190 20 2.5 2 106
A65L&F 1970 L930/301 & R930/300 30 180 N/A 3 1 106
B25 1969-70 R928/300 28 260 25 3 2 106
B44VR 1967, B44SS 1968 R930/300 30 230 25 3 2 107
B50MX 1971-72 R932/300 32 250 N/A 3 2 106
 
Amal Monobloc carburettor, front

Monobloc Range

Amal logo Amal Monobloc carburettor, rear

Introduced by Amal in 1955 to replace the Type 6 carburettor. There are currently the 376 (15/16", 1", 1&1/16" sizes) & 389 (1&1/8", 1&5/32", 1&3/16" sizes) series available, in left hand versions only. A 376 1&1/16" carb with a "chopped" float bowl is available. This allows for twin carbs to be mounted closely alongside on parallel port heads.

When ordering parts we will need to know the size of your carburettor. An identification number will be appear on the body e.g. 376/--, 389/--. This designates the body size. there is also a 689 version which is a right hand 389 body. To determine the bore size it should be measured at the mounting flange. Carburettors are supplied jetted to suit the majority of applications. Separate jets & slides are available for fine tuning.

The information given below is intended as a guide only, final settings required may vary due to local fuels etc.
Triumph Part Number Size mm Main Jet Pilot Jet Slide No. Needle Pos. Needle Jet
T100 1955-59 376/15 1&5/16" 220 25 3.5 4 106
T100SS 1961-65, T100/R/C 1966, T100S/C 1967 376/16 1" 190 25 3.5 3 106
TR6 1956-63 376/17 1&1/16" 250 25 3.5 3 106
T120 1964-67, T120R 1966 389/18 1&1/8" 260 25 3 3 106
6T 1963-66 376/17 1&1/16" 230 25 4 4 106
Norton
99 1956-62, 99 (twin carbs) 1959-62, 99SS 61-62 376/17 1&1/16" 250 25 3 3 106
650 1961-63, 650 De Luxe 389/18 1&1/8" 320 25 3 2 106
750 Atlas 1962-66 376/17 1&1/16" 400 20 3.5 4 106
750 Atlas 1963-64, 1966 389/18 1&1/8" 420 20 3 3 106
750 Atlas 1965 & 1966 export 389/18 1&1/8" 350 20 3 3 106
BSA
B31 1955-59 (without filter) 376/16 1" 260 30 3.5 2 106
B31 1956-57 (with filter), B31 export 58-59 376/16 1" 200 30 3.5 2 106
B33 1955-57, B33 home 1958-60 376/17 1&1/16" 260 25 3.5 3 106
A10 1955-57 376/17 1&1/16" 240 25 4 3 106
A50 USA 1963-67 376/16 1" 260 25 3.5 3 106
A65 1962, 1964-65 389/18 1&1/8" 300 25 3.5 3 106
 
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