307:
36:
242:
209:
identical to the 76 version, except that the main emulsion air is drawn from inside the air intake (air filter) whilst the 76 carburettor uses unfiltered air. The 76 types are of die-cast zinc construction and were introduced in the early 1930s, replacing the earlier 6 series, which were of bronze construction, although basically the same design. The 276 type was introduced in 1940 in an attempt to improve the carburettor's durability in dusty and dirty operating environments.
363:
475:
299:
532:
426:
These carburettors, introduced in 1973, were available in both flange and spigot mountings to suit the
Spanish manufacturers requirements. To distinguish this variant from the British made version, they became known as Mark 1.5 or Mark 1 1/2 and a 1 prefix added to the product number, for example the modified 626 became the 1626.
223:, developed and introduced for the 1967 Model Year, was initially designated 600 and 900. The 600 series had bore sizes of 22mm, 24mm and 26mm, being known as 622, 624, and 626 respectively. Similarly, the 900 series with bore sizes of 28mm, 30mm and 32mm, were known as 928, 930, and 932 respectively.
601:, and the product range was expanded to include handlebars and controls with full IMI ownership by the middle 1960s. It was sold after June 1973 to Grosvenor Works Ltd of North London - a supplier of fuel system components. Under Grosvenor some of the most popular obsolete ranges were remanufactured.
332:
All
Monoblocs were initially manufactured with the float chamber projecting on the left side of the body when viewed from the air intake. This led to fitment problems on twin carb installation. Amal introduced a "chopped" version of the 376 and 389 without the float chamber so twin carburettors could
569:
The GP2 series was introduced in 1962 to try to overcome the shortcomings of the GP. The pilot circuit was moved to the inlet side if the slide. The air bleed was taken from the incoming air rather than the outside, reducing the possibility of dirt ingress to the circuit. The moving of the pilot jet
485:
The TT (Series 27) was introduced in 1932 as a progression of the Type 27. A needle and needle jet were incorporated to provide additional tuning for road machines and when the carb was used with alcohol as a fuel. Pre-war models were suffixed with the year of manufacture but when production resumed
437:
Introduced in 1974, the Mark 2 used aluminium alloy for the main castings rather than the zinc alloy previously used. The cold starting system from the Mark 1.5 was integrated into the new design. Whilst the float chamber was still concentric with the main jet, it was now a square section. The pilot
539:
The GP (Series 316) was introduced in 1954 replacing both the TT and RN, and was a further development of the RN. Although the needle and jets were still offset, they were moved away from the side of the bore which simplified the needle mounting. Air for the pilot feed was taken from the outside of
425:
to produce carburettors in Spain. Initially this production was of 400, 600 and 900 series
Concentrics. 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.
465:
The Type 27 was Amal's first carburettor specifically designed for racing machines, and was based on AMAC's TT carburettor that had been introduced in 1924. A jet block and hollow slide were used. The body, jet block and slide were assembled and then machined as one unit to ensure perfect matching
314:
Introduced in 1954, the
Monobloc was introduced to reduce production cost. Whilst the design relied heavily on the previous standard series, the float chamber had been combined into the carburettor casting. The jet block and slide had been simplified and a removable pilot jet introduced instead of
518:
The RN (Series 185) was introduced in 1937 as a development of the TT. The needle and jets were moved to the side of the carburettor bore to give a less obstructed flow through the carburettor, although this caused a complicated attachment of the needle to the slide. Although at the time the less
289:
Ingress of dust and dirt caused premature wear to the carburettor, which was partially resolved by fitting air filters. The idle and air bleed circuits still drew air from outside the body which led to blocked jets and tubes. To overcome this types 274, 275, 276 & 289 were introduced in 1939
378:
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. There was no jet block, the jets being
229:
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.
208:
The most historic - 76 & 276 Series (Amal 'Standard' series) can be spigot or flange fixing with adjustment screws on the left or right hand sides of the carburetter body. The available bore sizes are 15/16", 1" and 1 1/16" diameters. The 276 type carburettor is, in virtually all aspects,
337:
twins used two chopped monoblocs and a remote float chamber mounted centrally behind the carbs. In 1964 a right hand version of the 389 was introduced, designated 689, which was a mirror image of the 389. This allowed twin carb installations with each carb having its own float chamber.
522:
Initial the RN was designated as a type of TT, eg 10TT37KN, but soon it was given its own type reference, eg 10RN. It was available in the same sizes as the 10TT and 15TT. This type was less popular than its parent TT. Production ended with the introduction of the GP in 1954.
257:
and the other components made of brass. The float chamber was manufactured as a separate unit and attached to the carburettor by an arm. To mount the carburettor to the engine, the carburettors were available in both flange and spigot options. Four body sizes were available:
399:
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. Following the introduction of other models of the Concentric, this model became known as the Mark 1.
581:
A smoothbore version of the 2000 series Mark
Concentric was made available for racing used. To obtain the "smoothbore", a jet block and hollow slide were fitted. Although the carb was never used as an OEM part, it was popular with smaller specialist racers.
189:
Amal's light-alloy levers with click-stop adjusters 509/001 brake and 509/002 clutch were taken-over by BSA and marketed under their 'Motoplas' accessories branding from 1967, with
Doherty taking-over production of the traditional chromed-steel levers.
466:
and unobstructed flow through the carburettor. No needle or needle jets were fitted. For starting a pilot jet and bypass were used. To reduce fuel surge when cornering, two float chambers were used with the 27, one mounted on either side of the carb.
408:
An updated version of the Mark 1, the
Premier, was introduced in 2012. The castings for the body and float bowl were in aluminium alloy and the slide was made of hard anodised aluminium. A new float was introduced that was resistant to the
560:
The GP suffered from pilot systems, partly due to dust and dirt entering through the air drilling. The pilot system also limited the carb from being used with more than 20° downdraft otherwise flooding of the pilot circuit occurred.
775:
As distinct from the bulk of the erstwhile Amal control-lever range (now made by Doherty) manufacture of Amal solid light-alloy sports levers has been taken over by the BSA group. These will now be sold under the Motoplas
438:
jet reverted to being removable and could be inserted in an alternate position for higher downdraught applications. Flange mounting was discontinued and the Mark 2 was only available in spigot mounting.
212:
In the same design range were the 4 and 5 types with smaller bore sizes and the 29 type with larger bore sizes. These were replaced with the 74, 75 and 89 and then, later, by the 274, 275 and 289 types.
699:
Amal factory advert – "Carburetters supplied suitable for all types of machines for every purpose. Backed by service throughout the world. All AMAL chromium plated components to BS1224/1965".
253:
Following the merger of Amac, Brown and Barlow, and Binks to form Amal, a new range of carburettors were introduced in 1929, the 'Standard' range. The body of these carburettors was cast in
590:
The AMAL company was formed in the late 1920s when three manufacturers amalgamated – Amac, Brown and Barlow, and Binks – to manufacture carburettors and associated products under the name
493:
As well as the spigot mounting as used by the Type 27, flange fixing was introduced. As the spigot mountings were susceptible to air leaks, flange mounting was seen as an improvement.
193:
With the decline of the British motorcycle industry, the use of Amal carburettors declined, but they are still produced under different ownership as spares for the classic market.
286:
bodies were introduced in 1932. These were designated types 74, 75, 76 and 89 and were virtually identical to the previous types, most of the components were interchangeable.
623:
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.
379:
mounted directly into the body. The pilot jet reverted to a drilling instead of a removable jet. Right and left hand carburettors were available with flange mountings only.
715:
New name in the accessories field is Lozells Engineering, an Amal subsidiary, sharing stand space with the parent company and displaying a range of handlebars and levers.
1228:
179:
Amal also produced handlebars and control levers for the motorcycle industry, via a subsidiary business, Lozells Engineering, twist grips, cables and wire, plus
114:
trademark. Amal was the supplier of carburettors to many marques within the British motorcycle industry including the largest of British manufacturers, such as
205:, Amal historically had three popular carburettor designs: 'Standard' fitted up to 1955, 'Monobloc' fitted from 1955 and 'Concentric' fitted from 1967.
674:
Amal factory advert – the 'new' Concentric and "wide range of controls, handlebars, etc. Amal Limited, Holdford Road, Witton, Birmingham 6." and p.632
306:
1081:
298:
1426:
226:
The largest bore at 32mm was slightly larger than any previous Monobloc, and all were flange-fitting with stud-holes at two-inch centres.
27:
103:
was a British engineering company servicing the motorcycle and other light-engineering motor industries between 1927 and 1993 based in
1421:
531:
429:
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.
241:
315:
the drilling on the Standard models. This allowed a common jet block to be used on different models. Three sizes were introduced:
1388:
1364:
1139:
341:
Production ended in 1967 when the Concentric was introduced. The Monobloc was reintroduced in 2014, the 375 body being cast in
510:
Sales of the 25TT were small and the model was discontinued in 1934. Production of the other two versions continued to 1954.
978:
735:..twin rotor twist-grip (for twin carburettors, of course)...The Amal Type 313...uses a very solid-looking die-cast body..."
35:
329:
The 375 was also available with a cast in air filter in 25/32" and 13/16" bore diameters. These were designated type 363.
186:. All AMAL chromium plated components were stated to be finished in "Nickel Chromium Plating, British Standard Approved."
119:
396:
To satisfy the demand for larger carburettors the 1000 series was introduced in 1970 with bore sizes of 34, 36 and 38mm.
180:
1369:, June 1973, p.23, "Amal the very breath of motor-cycling" "a subsidiary company of Imperial Metal Industries Ltd IMI"
1003:
375:
164:
were mainly for road-racing and other competition use, and were used on high-performance road machines such as
557:
Initially the GP was produced in zinc alloy but in the late 1950s the material was changed to aluminium ally.
619:
Amal carburettors were used on Cooper Formula 3 racing cars and racing motor cycles. Coopers fitted with the
367:
123:
319:
Type 375 - 21/32", 23/32", 25/32", 13/16" and 7/8" bore diameters, replacing the 274 and 275 standard types
678:"New carburettors are rare...the neat 600 and 900 Concentric carbs are at Earls Court for the first time."
310:
Chopped Amal Monobloc carburettors and remote float chamber fitted to a 1958 Triumph T120 Bonneville 650cc
134:
279:
body was expensive to produce and limited production throughput. To reduce production costs and time,
613:
334:
115:
104:
540:
the carb through a drilling. The GP was available in four body sizes and in flange mounting only:
173:
362:
202:
787:
609:
604:
In 2003, the business was sold to Burlen Fuel Systems Limited, a company that also produces
1257:
816:
766:
746:
726:
710:
694:
665:
342:
183:
1168:
927:
648:
474:
325:
Type 389 - 1 1/8", 1 5/32" and 1 3/16" bore diameters, replacing the 289 standard types
26:
374:
To reduce the technical and manufacturing problems of previous carbs and with pending
1415:
605:
165:
146:
153:, a later development with the float chamber directly below the body and air-slide.
169:
127:
1059:
421:
To supply demand for OEM carburettors for Spanish made motorcycles, Amal licensed
322:
Type 376 - 15/16", 1" and 1 1/16" bore diameters, replacing the 276 standard types
479:
111:
1378:
The J.A.P. Engine by A. C. Fenner and W. H. Phillips 1952 C Arthur Pearson Ltd.
597:
The name changed to Amal Ltd in 1931. Amal subsequently became partly owned by
216:
The 'Monobloc' type was available from 1955 with designations 375, 376 and 389
283:
67:
413:
in modern fuels. The pilot jet was removable. and the idle circuit improved.
333:
be fitted. Both carbs were fed from the float chamber of the left hand carb.
137:
for motorcycles. These were historically distinguishable as three types: the
598:
276:
62:
58:
802:
Motor Cycle Data Book, George Newnes Ltd, London, 1960. Accessed 2013-07-09
519:
restricted flow was seen as an advantage, later opinion was less positive.
201:
Besides carburettors for light-applications such as types 308 and 355 for
346:
280:
92:
410:
246:
1222:
1220:
1218:
1216:
620:
254:
302:
Amal 376 Monobloc carburettor fitted to a 1958 BSA A10 Golden Flash
953:
570:
allowed far greater downdraught angles without the jet flooding.
547:
10GP - 1 1/16", 1 3/32", 1 1/8", 1 5/32" and 1 3/8" bore diameters
530:
473:
361:
305:
297:
240:
954:"Burlen LTD Carburettor set for a Triumph T120 Bonneville 1959"
40:
Triple Amal Concentric carburettors fitted to a Triumph Trident
487:
1389:"Notes On Amal Motorcycle Carburettor Developments 1924-1976"
290:
which took the air feeds from the incoming filtered airflow.
233:
Eventually three variants were produced: Mk1, Mk1.5 and Mk2.
133:
The main carburettor types commonly associated with Amal are
1404:
573:
The GP2 was available in the same sizes as the original GP.
1082:"Inside The Genuine Amal MKI Premier Concentric Carburetor"
713:, 9 September 1965. p.366 Brighton Show 'Bits and Pieces' "
1203:
1201:
1105:
1103:
1026:
1024:
898:
896:
894:
892:
506:
10TT - 1 1/16", 1 3/32", 1 1/8" and 1 5/32" bore diameters
553:
10GP - 1 3/8", 1 13/32", 1 7/16 and 1 1/2" bore diameters
535:
Amal GP carburettor fitted to a 1956 BSA Gold Star 500cc
1336:
1334:
1309:
1307:
1305:
1280:
1278:
1188:
1186:
1122:
1120:
1118:
1041:
1039:
831:
829:
1060:"Trying out an AMAL Premier Carburetter, in real life"
271:
Type 29 - 1 3/32", 1 1/8" & 1 5/32" bore diameters
490:, all of the TTs had a 9 suffix regardless of year.
445:
2600 series - 22, 24, 25, 26 and 27mm bore diameters
366:
Amal Concentric carburettor, one of two fitted to a
262:
Type 4 - 21/32", 23/32" & 25/32" bore diameters
88:
78:
53:
45:
448:2900 series - 28, 30, 32 and 34mm bore diameters
651:. Grace's Industrial Guide. Retrieved 2013-07-09
544:15GP - 7/8, 15/16", 1" and 11/16" bore diameters
268:Type 6 - 15/16", 1" & 1 1/16" bore diameters
790:. Grace's Industrial Guide Retrieved 2013-07-09
1004:"Hard Anodised - The AMAL Carburetter Company"
8:
451:2000 series - 34, 36 and 38mm bore diameters
245:Amal type 276 carburettor fitted to a 1951
19:
503:15TT - 15/16", 1" and 11/16" bore diameters
349:slides to reduce wear were made available.
616:, three other classic carburettor ranges.
382:Three body sizes were initially produced:
370:, with the second just visible to the rear
34:
25:
18:
812:
810:
808:
644:
642:
640:
638:
636:
265:Type 5 - 13/16" & 7/8" bore diameters
16:British carburettor manufacturing company
979:"Amal Monobloc Carburettors 375/376/389"
798:
796:
788:Amal carburettors for pedal cycle motors
550:10GP - 1 7/32" and 1 3/8" bore diameters
690:
688:
686:
632:
1352:
1340:
1325:
1313:
1296:
1284:
1207:
1192:
1126:
1109:
1045:
1030:
914:
902:
883:
871:
859:
847:
835:
661:
659:
657:
392:900 series - 28 - 32 mm bore diameters
389:600 series - 22 - 27 mm bore diameters
386:400 series - 12 - 20 mm bore diameters
1258:"Amal Type 27 Dirt Track Carburettor"
1229:"The British Performance Carburettor"
1171:. Amal Carburettors. 2013. p. 43
141:, with a separate float chamber, the
7:
1391:– via www.bsaownersclub.co.uk.
84:previously also motorcycle controls
1149:(in Spanish). 2016. pp. 22–25
500:25TT - 3/4" and 7/8 bore diameters
14:
1236:Classic & Motorcycle Mechanic
441:Three body sizes were available:
928:"Triumph 650 Twin - RealClassic"
1246:– via archives.jampot.dk.
1140:"Catálogo Carburadores Arreche"
751:Earls Court Show Review edition
478:TT carburettor used on a 1955
236:
1:
1427:Engine fuel system technology
1387:Ullman, T. J. (24 May 2003).
1058:Harris, Dick (Summer 2012).
592:Amalgamated Carburetters Ltd
577:Mark 2 Smoothbore Concentric
496:Three body sizes were made:
156:Less-common types, known as
145:with an integral but offset
1443:
819:, 1 September 1966, p.298
1070:– via burlen.co.uk.
755:Amal LMC-series clip-ons.
33:
24:
1422:Carburetor manufacturers
670:Earls Court Show Edition
649:Amalgamated Carburetters
128:small industrial engines
1169:"Amal Catalogue 2013-8"
1062:. Vintage Bike Magazine
983:www.britishbikebits.com
1086:Classic British Spares
778:". Accessed 2013-08-09
771:Amal – Motoplas levers
731:Brighton Show Round-up
676:Show Guide editorial,
536:
482:
371:
311:
303:
250:
126:, and to producers of
823:. Accessed 2013-07-25
769:3 August 1967 p.1071
717:" Accessed 2013-08-19
697:, 7 April 1966, p.1.
534:
477:
365:
309:
301:
244:
1366:Motorcycle Mechanics
749:, 24 November 1966,
668:, 10 November 1966,
197:Carburettor products
932:Classic Bike Hub UK
757:Accessed 2013-07-09
737:Accessed 2013-08-07
701:Accessed 2013-07-10
680:Accessed 2013-07-08
456:Racing carburettors
345:. Replacement hard
105:Birmingham, England
21:
1179:– via Issuu.
821:Monobloc Dethroned
729:23 September 1965
537:
483:
372:
368:Triumph Bonneville
312:
304:
251:
203:Pedal Cycle Motors
174:Velocette Thruxton
135:slide carburettors
110:AMAL is a British
1355:, pp. 35–36.
1328:, pp. 34–35.
1299:, pp. 33–34.
1210:, pp. 32–33.
1112:, pp. 30–32.
1033:, pp. 29–30.
905:, pp. 28–29.
886:, pp. 26–27.
874:, pp. 25–26.
376:emission controls
237:'Standard' series
98:
97:
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1405:Official website
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934:. 31 August 2015
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423:Talleres Arreche
219:The more modern
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586:Company history
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343:aluminium alloy
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1397:External links
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1008:amalcarb.co.uk
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1343:, p. 35.
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1316:, p. 34.
1315:
1310:
1308:
1306:
1302:
1298:
1293:
1290:
1287:, p. 33.
1286:
1281:
1279:
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1263:
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1253:
1250:
1237:
1230:
1227:Gleed, John.
1223:
1221:
1219:
1217:
1213:
1209:
1204:
1202:
1198:
1195:, p. 32.
1194:
1189:
1187:
1183:
1170:
1164:
1161:
1148:
1141:
1135:
1132:
1129:, p. 36.
1128:
1123:
1121:
1119:
1115:
1111:
1106:
1104:
1100:
1088:. 10 May 2016
1087:
1083:
1077:
1074:
1061:
1054:
1051:
1048:, p. 30.
1047:
1042:
1040:
1036:
1032:
1027:
1025:
1021:
1009:
1005:
999:
996:
984:
980:
974:
971:
959:
955:
949:
946:
933:
929:
923:
920:
917:, p. 29.
916:
911:
908:
904:
899:
897:
895:
893:
889:
885:
880:
877:
873:
868:
865:
861:
856:
853:
850:, p. 27.
849:
844:
841:
838:, p. 25.
837:
832:
830:
826:
822:
818:
813:
811:
809:
805:
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167:
166:BSA Gold Star
163:
159:
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148:
147:float chamber
144:
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32:
28:
23:
1374:
1365:
1360:
1348:
1321:
1292:
1265:. Retrieved
1261:
1252:
1240:. Retrieved
1235:
1173:. Retrieved
1163:
1151:. Retrieved
1146:
1134:
1090:. Retrieved
1085:
1076:
1064:. Retrieved
1053:
1011:. Retrieved
1007:
998:
986:. Retrieved
982:
973:
961:. Retrieved
958:burlen.co.uk
957:
948:
936:. Retrieved
931:
922:
910:
879:
867:
862:, p. 8.
855:
843:
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178:
170:BSA Spitfire
161:
157:
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142:
138:
132:
109:
100:
99:
82:Carburettors
54:Headquarters
1353:Ullman 2003
1341:Ullman 2003
1326:Ullman 2003
1314:Ullman 2003
1297:Ullman 2003
1285:Ullman 2003
1262:500race.org
1208:Ullman 2003
1193:Ullman 2003
1127:Ullman 2003
1110:Ullman 2003
1046:Ullman 2003
1031:Ullman 2003
915:Ullman 2003
903:Ullman 2003
884:Ullman 2003
872:Ullman 2003
860:Ullman 2003
848:Ullman 2003
836:Ullman 2003
817:Motor Cycle
767:Motor Cycle
747:Motor Cycle
727:Motor Cycle
711:Motor Cycle
695:Motor Cycle
666:Motor Cycle
480:Manx Norton
112:carburettor
66:previously
1416:Categories
1147:arreche.es
627:References
353:Concentric
284:zinc alloy
221:Concentric
151:Concentric
93:Burlen Ltd
68:Birmingham
733:, p.433 "
599:IMI Group
277:sand cast
63:Wiltshire
59:Salisbury
1267:25 April
1242:29 April
1175:25 April
1153:25 April
1092:25 April
1066:25 April
1013:25 April
988:25 April
963:25 April
938:25 April
417:Mark 1.5
347:anodised
294:Monobloc
281:die cast
149:and the
143:Monobloc
139:Standard
79:Products
46:Industry
1238:: 32–35
461:Type 27
411:ethanol
404:Premier
335:Triumph
247:BSA B31
116:Triumph
89:Website
753:p.697
621:J.A.P.
614:Zenith
486:after
433:Mark 2
358:Mark 1
255:bronze
1232:(PDF)
1143:(PDF)
672:p.15
610:Solex
249:350cc
49:Motor
1269:2021
1244:2021
1177:2021
1155:2021
1094:2021
1068:2021
1015:2021
990:2021
965:2021
940:2021
776:name
612:and
275:The
172:and
160:and
122:and
101:AMAL
20:Amal
565:GP2
488:WW2
181:ICI
162:TT,
124:AMC
120:BSA
1418::
1333:^
1304:^
1277:^
1260:.
1234:.
1215:^
1200:^
1185:^
1145:.
1117:^
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1038:^
1023:^
1006:.
981:.
956:.
930:.
891:^
828:^
807:^
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685:^
656:^
635:^
608:,
606:SU
594:.
527:GP
514:RN
470:TT
176:.
168:,
158:GP
130:.
118:,
107:.
73:UK
71:,
61:,
1271:.
1157:.
1096:.
1017:.
992:.
967:.
942:.
773:"
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