AMAL was a British engineering company servicing the motorcycle and other light-engineering motor industries between 1927 and 1993[1] based in Birmingham, England.

Amal also produced handlebars and control levers for the motorcycle industry,[2] via a subsidiary business, Lozells Engineering,[4] twist grips,[5] cables and wire, plus ICI silicone grease.

The 276 type was introduced in 1940 in an attempt to improve the carburettor's durability in dusty and dirty operating environments.

[10] The largest bore at 32mm was slightly larger than any previous Monobloc, and all were flange-fitting with stud-holes at two-inch centres.

[10] The Concentric design with non-protruding float chamber was both slimmer and shorter, enabling easier mounting to two-port cylinder heads.

Left or right sided carburettors could be produced from basically the same die-casting, and the design was compatible with up to 40 degrees of downdraught.

To reduce production costs and time, die cast zinc alloy bodies were introduced in 1932.

[14] Ingress of dust and dirt caused premature wear to the carburettor, which was partially resolved by fitting air filters.

Whilst the design relied heavily on the previous standard series, the float chamber had been combined into the carburettor casting.

[17] All Monoblocs were initially manufactured with the float chamber projecting on the left side of the body when viewed from the air intake.

Amal introduced a "chopped" version of the 376 and 389 without the float chamber so twin carburettors could be fitted.

[16] Triumph twins used two chopped monoblocs and a remote float chamber mounted centrally behind the carbs.

[21] To reduce the technical and manufacturing problems of previous carbs and with pending emission controls requiring more accurate fuel metering, a new carburettor, the Concentric, was introduced for the 1968 model year.

A hemispherical float chamber was introduced below and concentric with the main jet to eliminate differences in fuel height during cornering.

[23] The British motorcycle industry was in decline and with the lack of orders for OEM carburettors, production was limited after 1975 for replacement and aftermarket sales.

The Spanish motorcycle manufacturers required a better cold starting system so Amal and Talleres Arreche jointly designed modifications to the concentric to provide a separate enrichment circuit.

[26] A derivative of the 400 series is still in production by Talleres Arreche in 16, 18 and 20 mm bores with Amal embossed on the body.

The pilot jet reverted to being removable and could be inserted in an alternate position for higher downdraught applications.

The body, jet block and slide were assembled and then machined as one unit to ensure perfect matching and unobstructed flow through the carburettor.

[38] The GP suffered from pilot systems, partly due to dust and dirt entering through the air drilling.

[1] It was sold after June 1973[40] to Grosvenor Works Ltd of North London - a supplier of fuel system components.

[1] In 2003, the business was sold to Burlen Fuel Systems Limited, a company that also produces SU, Solex and Zenith, three other classic carburettor ranges.

1,100 cc engine with such a carburettor were popular in hill climbs and sprints competitions, and were used by the frequent champion in the 1960s, David Boshier Jones.