There were two versions of the 990cc Model 34-2, the standard English model, and the "Export" which had footboards and broader handlebars designed to better cope with conditions in the colonies, as they were rather quaintly termed, including Australia and North America.
The dry-sump sidevalve V-twin has a square b/s of 85.5 x 85.5 mm driving via a Sturmey-Archer gearbox controlled via a series of levers and couplings by a lever mounted on the side of the tank (opposite sides for English and Export).
The instrumentation is quite distinctive, being encased in a compartment on top of the fuel tank, except for the speedometer which is conventionally located.
MOTORE
Scoppio
TEMPI: 4 CILINDRI: 2 ALESAGGIO: mm 85,5 CORSA: 85,5 CILINDRATA cc: 990 POTENZA CV: 9,9 KW: GIRI/min.: 4000
RAFFREDDAMENTO: ad aria naturale
TESTATA: riportata
SISTEMA ALIMENTAZIONE: a carburatore Amal
DISTRIBUZIONE: punterie
VALVOLE: numero 2 laterali
LUBRIFICAZIONE: pompa di mandata e recupero
ACCENSIONE: a magnete marca Lucas
AVVIAMENTO: a pedivella
FRIZIONE: A dischi multipli
CAMBIO: Marca: AJS n. velocità: 4 separato
TIPO: ad ingranaggi COMANDO: a mano
TRASMISSIONE PRIMARIA (motore-cambio): catena. SECONDARIA (cambio-ruota): catena. DIRETTA (motore-ruota)
TELAIO
PROFILATI A SEZIONE: tubolare
TIPO: a culla chiusa
PASSO: mm. 2.134
STERZO Diretto
SOSPENSIONI ANTERIORE: parallelogramma
TIPO MOLLEGGIO: molla centrale
POSTERIORE: non prevista
TIPO MOLLEGGIO:
FRENI FUNZIONAMENTO: meccanico
FRENO ANTERIORE:
TIPO: a tamburo
FRENO POSTERIORE: singolo
TIPO: a tamburo
RUOTE A raggi
TIPO PNEUMATICI: a cerchietti
MISURA PNEUMATICI: anteriore: 4,00 x 19 posteriore: 4,00 x 19
IMPIANTO ILLUMINAZIONE
Marca e tipo fanale: Lucas
Illuminazione:
elettrica
SELLERIE
Numero posti sul motoveicolo (escluso eventuale
sidecar): 2
Tipo sella:molle fissate al
telaio
MATERIALE RIVESTIMENTO: cuoio
FINITURE
TRATTAMENTI GALVANICI: cromature verniciatura
COLORAZIONI (codici, ripartizioni colori e filetti): nero - Filetti: parafanghi e borsette:non previsti serbatoi:di stacco oro
SPECIFICATION.
ENGINE High efficiency 50-degree twin cylinder 9.9 h.p. Bore 85.5 m.m. Stroke 85.5 m.m. Capacity 990 c.c. with detachable cylinder heads, which, when removed leave the valves "in situ." Anti-slap light weight " Lo-ex " alloy pistons, roller bearing big ends and driving side mainshaft bearing. Tappets, and valve gear totally enclosed and lubricated, timing gears submerged in oil.
LUBRICATION - Thoroughly tested dry-sump system, incorporating pressure fabric type oil filter, ensuring the removal of all impurities from the oil in circulation.
GEAR BOX - Four-speed pivot-mounted Sturmey-Archer made to A. J. S." design, conveniently placed gear change quadrant on petrol tank. with ferodo and cork inserts. Push rod and cable adjuster provided, hand control with light tension.
FRAME - Cradle type with low saddle position and sidecar lugs made integral.
SPRING FORKS - Centre barrel spring type with long movement and adjustable spindles, hand adjustable shock absorber.
BRAKES - Internal expanding front and rear. Front 7 in. diameter with iron alloy drum possessing cooling fins. Rear 7¾ in. diameter. Both are fitted with dust and water excluders and finger adjustment. Front, hand operated. Rear, foot operated.
CARBURETTOR - " Amal " needle-type with pilot jet and throttle stop, large "Amal " air filter.
REAR CARRIER - Welded tubular steel with quickly detachable top. Two pannier bags provided.
TANKS - Chromium plated petrol tank with usual "A. J. S." black and gold design. Flush fitting instrument panel mounted on top of the tank, containing switches, ammeter and provision for watch. A separate oil tank with accessible filler cap, is mounted under the saddle. Capacity approximately 5 pints.
TRANSMISSION - Front chain size ½ in. x .305 in. running in oil bath. Efficient shock absorber mounted on engine shaft lubricated by oil bath. Rear chain size 5/8 in. x 3/8 in. with top and back chain cover.
WHEELS - Well known patent "A. J .S." quickly detachable and interchangeable wheels front and rear, special locking device for sleeve bolts. Extra heavy 19 ill. A 3 in. 14 gauge rims with 6-9 gauge, butted spokes, giving enormous strength.
TYRES - Heavy duty 27 in. x 4 in. Cord Tyres.
MUDGUARDS - Deeply valanced front mudguard, wide section giving ample tyre clearance. Rear mudguard detachable for easy wheel removal.
HANDLEBARS - Semi-sports clean type, black enamel with chromium plated levers.
SADDLE - Comfortable pan seat with three-points suspension hinged at the front.
STEERING DAMPER - Control knob conveniently situated on steering head. Duplex Plates with large frictional surfaces and rigid anchorage eliminating back lash.
PRICE - To Standard Specification £65-0-0
GEAR BOX - Conveniently placed gear change quadrant on left side of petrol tank.
HANDLEBARS - Long comfortable touring handlebars with twist grip control.
The Export Model has footboards - all other specifications same as English Model.
From the 1934 AJS Catalogue
If you have a query or information about AJS motorcycles please contact us
