318:
47:
253:
220:
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.
374:
486:
310:
543:
437:
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.
234:, 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.
612:, 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.
343:
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
580:
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
496:
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
448:
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
550:
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
436:
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.
476:
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
325:
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
529:
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
300:
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
389:
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
240:
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.
219:
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,
348:
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.
533:
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.
268:
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:
410:
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.
592:
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.
200:
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.
477:
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.
419:
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
571:
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.
786:
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
449:
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.
223:
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.
710:
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".
264:
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
601:
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
504:
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.
204:
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.
297:
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.
634:
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.
390:
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.
726:
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.
1239:
190:
Amal also produced handlebars and control levers for the motorcycle industry, via a subsidiary business, Lozells Engineering, twist grips, cables and wire, plus
125:
trademark. Amal was the supplier of carburettors to many marques within the British motorcycle industry including the largest of British manufacturers, such as
216:, Amal historically had three popular carburettor designs: 'Standard' fitted up to 1955, 'Monobloc' fitted from 1955 and 'Concentric' fitted from 1967.
685:
Amal factory advert – the 'new' Concentric and "wide range of controls, handlebars, etc. Amal Limited, Holdford Road, Witton, Birmingham 6." and p.632
317:
1092:
309:
1437:
237:
The largest bore at 32mm was slightly larger than any previous Monobloc, and all were flange-fitting with stud-holes at two-inch centres.
38:
114:
was a British engineering company servicing the motorcycle and other light-engineering motor industries between 1927 and 1993 based in
1432:
542:
440:
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.
252:
326:
the drilling on the Standard models. This allowed a common jet block to be used on different models. Three sizes were introduced:
1399:
1375:
1150:
352:
Production ended in 1967 when the Concentric was introduced. The Monobloc was reintroduced in 2014, the 375 body being cast in
521:
Sales of the 25TT were small and the model was discontinued in 1934. Production of the other two versions continued to 1954.
989:
746:..twin rotor twist-grip (for twin carburettors, of course)...The Amal Type 313...uses a very solid-looking die-cast body..."
46:
340:
The 375 was also available with a cast in air filter in 25/32" and 13/16" bore diameters. These were designated type 363.
197:. All AMAL chromium plated components were stated to be finished in "Nickel Chromium Plating, British Standard Approved."
130:
407:
To satisfy the demand for larger carburettors the 1000 series was introduced in 1970 with bore sizes of 34, 36 and 38mm.
191:
1380:, June 1973, p.23, "Amal the very breath of motor-cycling" "a subsidiary company of Imperial Metal Industries Ltd IMI"
1014:
386:
175:
were mainly for road-racing and other competition use, and were used on high-performance road machines such as
568:
Initially the GP was produced in zinc alloy but in the late 1950s the material was changed to aluminium ally.
630:
Amal carburettors were used on Cooper Formula 3 racing cars and racing motor cycles. Coopers fitted with the
378:
134:
330:
Type 375 - 21/32", 23/32", 25/32", 13/16" and 7/8" bore diameters, replacing the 274 and 275 standard types
689:"New carburettors are rare...the neat 600 and 900 Concentric carbs are at Earls Court for the first time."
321:
Chopped Amal Monobloc carburettors and remote float chamber fitted to a 1958 Triumph T120 Bonneville 650cc
145:
290:
body was expensive to produce and limited production throughput. To reduce production costs and time,
624:
345:
126:
115:
551:
the carb through a drilling. The GP was available in four body sizes and in flange mounting only:
184:
373:
213:
798:
620:
615:
In 2003, the business was sold to Burlen Fuel Systems Limited, a company that also produces
1268:
827:
777:
757:
737:
721:
705:
676:
353:
194:
1179:
938:
659:
485:
336:
Type 389 - 1 1/8", 1 5/32" and 1 3/16" bore diameters, replacing the 289 standard types
37:
385:
To reduce the technical and manufacturing problems of previous carbs and with pending
1426:
616:
176:
157:
164:, a later development with the float chamber directly below the body and air-slide.
180:
138:
1070:
432:
To supply demand for OEM carburettors for Spanish made motorcycles, Amal licensed
333:
Type 376 - 15/16", 1" and 1 1/16" bore diameters, replacing the 276 standard types
490:
122:
1389:
The J.A.P. Engine by A. C. Fenner and W. H. Phillips 1952 C Arthur Pearson Ltd.
608:
The name changed to Amal Ltd in 1931. Amal subsequently became partly owned by
227:
The 'Monobloc' type was available from 1955 with designations 375, 376 and 389
294:
78:
424:
in modern fuels. The pilot jet was removable. and the idle circuit improved.
344:
be fitted. Both carbs were fed from the float chamber of the left hand carb.
148:
for motorcycles. These were historically distinguishable as three types: the
609:
287:
73:
69:
813:
Motor Cycle Data Book, George Newnes Ltd, London, 1960. Accessed 2013-07-09
530:
restricted flow was seen as an advantage, later opinion was less positive.
212:
Besides carburettors for light-applications such as types 308 and 355 for
357:
291:
103:
421:
257:
17:
1233:
1231:
1229:
1227:
631:
265:
313:
Amal 376 Monobloc carburettor fitted to a 1958 BSA A10 Golden Flash
964:
581:
allowed far greater downdraught angles without the jet flooding.
558:
10GP - 1 1/16", 1 3/32", 1 1/8", 1 5/32" and 1 3/8" bore diameters
541:
484:
372:
316:
308:
251:
965:"Burlen LTD Carburettor set for a Triumph T120 Bonneville 1959"
51:
Triple Amal Concentric carburettors fitted to a Triumph Trident
498:
1400:"Notes On Amal Motorcycle Carburettor Developments 1924-1976"
301:
which took the air feeds from the incoming filtered airflow.
244:
Eventually three variants were produced: Mk1, Mk1.5 and Mk2.
144:
The main carburettor types commonly associated with Amal are
1415:
584:
The GP2 was available in the same sizes as the original GP.
1093:"Inside The Genuine Amal MKI Premier Concentric Carburetor"
724:, 9 September 1965. p.366 Brighton Show 'Bits and Pieces' "
1214:
1212:
1116:
1114:
1037:
1035:
909:
907:
905:
903:
517:
10TT - 1 1/16", 1 3/32", 1 1/8" and 1 5/32" bore diameters
564:
10GP - 1 3/8", 1 13/32", 1 7/16 and 1 1/2" bore diameters
546:
Amal GP carburettor fitted to a 1956 BSA Gold Star 500cc
1347:
1345:
1320:
1318:
1316:
1291:
1289:
1199:
1197:
1133:
1131:
1129:
1052:
1050:
842:
840:
1071:"Trying out an AMAL Premier Carburetter, in real life"
282:
Type 29 - 1 3/32", 1 1/8" & 1 5/32" bore diameters
501:, all of the TTs had a 9 suffix regardless of year.
456:
2600 series - 22, 24, 25, 26 and 27mm bore diameters
377:
Amal Concentric carburettor, one of two fitted to a
273:
Type 4 - 21/32", 23/32" & 25/32" bore diameters
99:
89:
64:
56:
459:2900 series - 28, 30, 32 and 34mm bore diameters
662:. Grace's Industrial Guide. Retrieved 2013-07-09
555:15GP - 7/8, 15/16", 1" and 11/16" bore diameters
279:Type 6 - 15/16", 1" & 1 1/16" bore diameters
801:. Grace's Industrial Guide Retrieved 2013-07-09
1015:"Hard Anodised - The AMAL Carburetter Company"
8:
462:2000 series - 34, 36 and 38mm bore diameters
256:Amal type 276 carburettor fitted to a 1951
30:
514:15TT - 15/16", 1" and 11/16" bore diameters
360:slides to reduce wear were made available.
627:, three other classic carburettor ranges.
393:Three body sizes were initially produced:
381:, with the second just visible to the rear
45:
36:
29:
823:
821:
819:
655:
653:
651:
649:
647:
276:Type 5 - 13/16" & 7/8" bore diameters
27:British carburettor manufacturing company
990:"Amal Monobloc Carburettors 375/376/389"
809:
807:
799:Amal carburettors for pedal cycle motors
561:10GP - 1 7/32" and 1 3/8" bore diameters
701:
699:
697:
643:
1363:
1351:
1336:
1324:
1307:
1295:
1218:
1203:
1137:
1120:
1056:
1041:
925:
913:
894:
882:
870:
858:
846:
672:
670:
668:
403:900 series - 28 - 32 mm bore diameters
400:600 series - 22 - 27 mm bore diameters
397:400 series - 12 - 20 mm bore diameters
1269:"Amal Type 27 Dirt Track Carburettor"
1240:"The British Performance Carburettor"
1182:. Amal Carburettors. 2013. p. 43
152:, with a separate float chamber, the
7:
1402:– via www.bsaownersclub.co.uk.
95:previously also motorcycle controls
1160:(in Spanish). 2016. pp. 22–25
511:25TT - 3/4" and 7/8 bore diameters
25:
1247:Classic & Motorcycle Mechanic
452:Three body sizes were available:
939:"Triumph 650 Twin - RealClassic"
1257:– via archives.jampot.dk.
1151:"Catálogo Carburadores Arreche"
762:Earls Court Show Review edition
489:TT carburettor used on a 1955
247:
1:
1438:Engine fuel system technology
1398:Ullman, T. J. (24 May 2003).
1069:Harris, Dick (Summer 2012).
603:Amalgamated Carburetters Ltd
588:Mark 2 Smoothbore Concentric
507:Three body sizes were made:
167:Less-common types, known as
156:with an integral but offset
1454:
830:, 1 September 1966, p.298
1081:– via burlen.co.uk.
766:Amal LMC-series clip-ons.
44:
35:
1433:Carburetor manufacturers
681:Earls Court Show Edition
660:Amalgamated Carburetters
139:small industrial engines
1180:"Amal Catalogue 2013-8"
1073:. Vintage Bike Magazine
994:www.britishbikebits.com
1097:Classic British Spares
789:". Accessed 2013-08-09
782:Amal – Motoplas levers
742:Brighton Show Round-up
687:Show Guide editorial,
547:
493:
382:
322:
314:
261:
137:, and to producers of
834:. Accessed 2013-07-25
780:3 August 1967 p.1071
728:" Accessed 2013-08-19
708:, 7 April 1966, p.1.
545:
488:
376:
320:
312:
255:
1377:Motorcycle Mechanics
760:, 24 November 1966,
679:, 10 November 1966,
208:Carburettor products
943:Classic Bike Hub UK
768:Accessed 2013-07-09
748:Accessed 2013-08-07
712:Accessed 2013-07-10
691:Accessed 2013-07-08
467:Racing carburettors
356:. Replacement hard
116:Birmingham, England
32:
1190:– via Issuu.
832:Monobloc Dethroned
740:23 September 1965
548:
494:
383:
379:Triumph Bonneville
323:
315:
262:
214:Pedal Cycle Motors
185:Velocette Thruxton
146:slide carburettors
121:AMAL is a British
1366:, pp. 35–36.
1339:, pp. 34–35.
1310:, pp. 33–34.
1221:, pp. 32–33.
1123:, pp. 30–32.
1044:, pp. 29–30.
916:, pp. 28–29.
897:, pp. 26–27.
885:, pp. 25–26.
387:emission controls
248:'Standard' series
109:
108:
16:(Redirected from
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1416:Official website
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945:. 31 August 2015
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434:Talleres Arreche
230:The more modern
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1408:External links
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1342:
1338:
1333:
1330:
1327:, p. 34.
1326:
1321:
1319:
1317:
1313:
1309:
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1301:
1298:, p. 33.
1297:
1292:
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1270:
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1248:
1241:
1238:Gleed, John.
1234:
1232:
1230:
1228:
1224:
1220:
1215:
1213:
1209:
1206:, p. 32.
1205:
1200:
1198:
1194:
1181:
1175:
1172:
1159:
1152:
1146:
1143:
1140:, p. 36.
1139:
1134:
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1126:
1122:
1117:
1115:
1111:
1099:. 10 May 2016
1098:
1094:
1088:
1085:
1072:
1065:
1062:
1059:, p. 30.
1058:
1053:
1051:
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1043:
1038:
1036:
1032:
1020:
1016:
1010:
1007:
995:
991:
985:
982:
970:
966:
960:
957:
944:
940:
934:
931:
928:, p. 29.
927:
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910:
908:
906:
904:
900:
896:
891:
888:
884:
879:
876:
872:
867:
864:
861:, p. 27.
860:
855:
852:
849:, p. 25.
848:
843:
841:
837:
833:
829:
824:
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820:
816:
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177:BSA Gold Star
174:
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159:
158:float chamber
155:
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136:
132:
128:
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43:
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19:
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1371:
1359:
1332:
1303:
1276:. Retrieved
1272:
1263:
1251:. Retrieved
1246:
1184:. Retrieved
1174:
1162:. Retrieved
1157:
1145:
1101:. Retrieved
1096:
1087:
1075:. Retrieved
1064:
1022:. Retrieved
1018:
1009:
997:. Retrieved
993:
984:
972:. Retrieved
969:burlen.co.uk
968:
959:
947:. Retrieved
942:
933:
921:
890:
878:
873:, p. 8.
866:
854:
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773:
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181:BSA Spitfire
172:
168:
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149:
143:
120:
111:
110:
93:Carburettors
65:Headquarters
1364:Ullman 2003
1352:Ullman 2003
1337:Ullman 2003
1325:Ullman 2003
1308:Ullman 2003
1296:Ullman 2003
1273:500race.org
1219:Ullman 2003
1204:Ullman 2003
1138:Ullman 2003
1121:Ullman 2003
1057:Ullman 2003
1042:Ullman 2003
926:Ullman 2003
914:Ullman 2003
895:Ullman 2003
883:Ullman 2003
871:Ullman 2003
859:Ullman 2003
847:Ullman 2003
828:Motor Cycle
778:Motor Cycle
758:Motor Cycle
738:Motor Cycle
722:Motor Cycle
706:Motor Cycle
677:Motor Cycle
491:Manx Norton
123:carburettor
77:previously
1427:Categories
1158:arreche.es
638:References
364:Concentric
295:zinc alloy
232:Concentric
162:Concentric
104:Burlen Ltd
79:Birmingham
744:, p.433 "
610:IMI Group
288:sand cast
74:Wiltshire
70:Salisbury
1278:25 April
1253:29 April
1186:25 April
1164:25 April
1103:25 April
1077:25 April
1024:25 April
999:25 April
974:25 April
949:25 April
428:Mark 1.5
358:anodised
305:Monobloc
292:die cast
160:and the
154:Monobloc
150:Standard
90:Products
57:Industry
1249:: 32–35
472:Type 27
422:ethanol
415:Premier
346:Triumph
258:BSA B31
127:Triumph
100:Website
18:Amal GP
764:p.697
632:J.A.P.
625:Zenith
497:after
444:Mark 2
369:Mark 1
266:bronze
1243:(PDF)
1154:(PDF)
683:p.15
621:Solex
260:350cc
60:Motor
1280:2021
1255:2021
1188:2021
1166:2021
1105:2021
1079:2021
1026:2021
1001:2021
976:2021
951:2021
787:name
623:and
286:The
183:and
171:and
133:and
112:AMAL
31:Amal
576:GP2
499:WW2
192:ICI
173:TT,
135:AMC
131:BSA
1429::
1344:^
1315:^
1288:^
1271:.
1245:.
1226:^
1211:^
1196:^
1156:.
1128:^
1113:^
1095:.
1049:^
1034:^
1017:.
992:.
967:.
941:.
902:^
839:^
818:^
806:^
696:^
667:^
646:^
619:,
617:SU
605:.
538:GP
525:RN
481:TT
187:.
179:,
169:GP
141:.
129:,
118:.
84:UK
82:,
72:,
1282:.
1168:.
1107:.
1028:.
1003:.
978:.
953:.
784:"
20:)
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