How To Select An Amal Concentric Carburetor
Choosing a new carburetor for your vintage British motorcycle can be challenging and confusing as parts over the years often get changed
Although all Amal Concentric (MK1) carbs look the same, internally they are not
Understanding the challenges one may face, I was motivated to compile a simple yet effective chart below that will aide you when purchasing a new Amal Concentric carburetor from Classic British Spares or perhaps selecting an original carburetor for your application
We understand that this topic could be discussed in great lengths, however we will keep it short and to the point which will help “most” folks make the proper choice when seeking a new Amal Concentric carburetor
Before we go over our chart, we hope that you check your parts book, workshop manual and your manifold to help you identify what carb you may need
Workshop manuals and parts books
Did you know that a factory workshop manual and a factory parts book will list the proper carburetor that was fitted to a specific machine?
When in doubt, grab a workshop manual or a parts book for your year, make and model and find the carb size that was originally fitted to your machine
Click here for a free parts book and click here for a free workshop manual
Manifolds
Should you have the proper manifold on your motorcycle, it is important to measure the inside diameter to obtain a reading either in metric (for Amal Concentric carbs) or imperial / inch (for Amal Monobloc carbs)
Using the measurement from your manifold, it will aide you in finding the proper carb - please keep in mind that some manifolds taper and some manifolds may have a different bore size than the carb that would normally be fitted
Those that do not have an external or "bolt on" manifold, you can measure the opening of the inlet port (shown above)
Cylinder head casting numbers
Often times hidden and hard to find, a casting number can provide you with much information in regards to the identity of the given head and also the port size
Always check your casting number first to find the original origins of your cylinder
Your specific application
Having good judgment also helps when making a carb selection
Knowing your engine specs and overall condition (stock, modified, cams, pistons, etc) may give you a good idea as to what can be fitted to your engine
Amal Concentric carbs fitment list
Amal Concentric carbs where fitted to some models in 1967 but fitted to all models starting in 1968-1978 (early)
Here are some things to know when considering an original, new or Amal Premier Concentric carb..
Concentric:
- R = Right Hand
- L = Left Hand
- 900 series / 30MM = 930
- Mounting Spacing = 2" (same as Monobloc)
Below is a quick chart of Amal Concentric carbs and applications
Click here to purchase or view our entire inventory of Amal Concentric carburetors
Triumph
| Application (Make / Model / Year) | Carb Type | Bore |
|
T120 / T140 1968-1978
|
R930 & L930 Set (Concentric) | 30MM |
|
TR6 / TR7 1968-1983
|
R930 (Concentric) | 30MM |
| T150 / T160 1968-1976 | 627 Carb Set (Concentric) | 27MM |
| TR25W / T25 1968-1972 | R928 (Concentric) | 28MM |
| T100R 1968-1974 | R626 & L626A Set (Concenteric) | 26MM |
| T100C / TR5T | R626 (Concentric) | 26MM |
BSA
| Application (Make / Model / Year) | Carb Type | Bore |
| A65L / A65FS 1968-1972 | R930 & L930 Set(Concentric) | 30MM |
| A65 Spitfire 1967-1968 | R932 & L932 Set (Concentric) | 32MM |
| C25 / B25 1967-1970 | R928 (Concentric) | 28MM |
| A50 1968-1970 | R626 (Concentric) | 26MM |
| A75 / Rocket III | 627 Carb Set (Concentric) | 27MM |
| A65T 1968-1970 | R928 (Concentric) | 28MM |
| B44VS / B44SS 1968-1970 | R930 (Concentric) | 30MM |
| B50 1971-1973 | R930 (Concentric) | 30MM |
Norton
| Application (Make / Model / Year) | Carb Type | Bore |
| Commando 750 | R932 & L932 Set (Concentric) | 32MM |
| Commando 850 | R932 & L932 Set (Concentric) | 32MM |
Click here for more information on the new "Amal Premier carburetors"
Amal Monobloc carbs fitment list
Many folks like to install Amal Concentric carbs on early Triumph and BSA models as an “upgrade”
Below is a chart suited for early Triumph & BSA models that would like to upgrade to a Concentric carb
*When upgrading from an Amal Monobloc carb, keep in mind that your existing throttle cables will need to be changed or modified to work with a Concentric carburetor
Click here to purchase or view our entire inventory of Amal Monobloc carburetors
Triumph Monobloc Replacement Carbs
| Application (Make / Model / Year) | Carb Type | Bore |
| T120 1959-1965 | R930 & L930 Set (Concentric) | 30MM |
| TR6 / 6T To 1965 | R930 (Concentric) | 30MM |
| T110 | R930 (Concentric) | 30MM |
| T90 / T100 1963-1967 | R626 (Concentric) | 36MM |
| T100R 1967 | R626 & L626A Set (Concentric) | 26MM |
BSA Monobloc Replacement Carbs
| Application (Make / Model / Year) | Carb Type | Bore |
| A65T / A65H 1962-1967 | R928 (Concentric) | 28MM |
| A50 1962-1967 | R626 (Concentric) | 26MMM |
| A65L / A65H 1964-1967 | R930 & L930 Set(Concentric) | 30MM |
| B44VS 1966-1967 | R930 (Concentric) | 30MM |
| B40 1958-1965 | R928 (Concentric) | 28MM |
| A10 (Alloy Head) | R930 (Concentric) | 30MM |
| A7 (Alloy Head) | R928 (Concentric) | 28MM |
Jeff Marsh
I would like to buy an Amal Premier carb for my 1958 BSA A10 Super Rocket
I don’t know the correct slide and jets required.. can you help?
Thanks
.. Jeff
Arthur
1961 triumph t120 how much for a pair of concentrics with correct jetting,I have a pair of 928,s on now but it won’t runk
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Classic British Spares
@DAG – we stock different slides – 27MM