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Monobloc Range
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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.
A good range of parts is available for these carburettors from British Spares. A sample list of applications is shown below for your reference.
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| 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 |
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| 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 |
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| 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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Much of the above information has been taken from the restoration series of publications
by Roy Bacon, which are available from British Spares. For more information click here
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