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Technical Info > Amal Carburettors > Mk1 Concentric 
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.

This carb. type was almost universally fitted to British bikes. A large range of spares for petrol & alcohol versions is available from British Spares. A list of sample applications is shown below for your reference.

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

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