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1931 Ulster


Numbered 42996 to 46500 (approx). Bolt on seat stays with cam type chainstays for rear wheel adjustment.


WM2x20 (f), WM2x20 (r), interchangeable with black enamelled rims. Black spokes with NPB nipples. Bolt on rear sprocket.


Plain inverted 6” U section, both unvalanced. Rear, with hinged tail piece.


Petrol tank black with gold lined panels. Single offset CEE-ESS type filler with front fitted petrol balance pipe. Single bolt damper arm fixing and side cut away for sparking plug access. Brass lever petrol tap. Oval 'Rudge-Whitworth' rubber gnee grips.


Numbered 1 to 4900 (approx) - 4 valve 499cc with iron open valve parallel inlet & parallel exhaust cylinder head. Rockers carried on cast pillars. Cast alloy plain rocker box.18mm central plug. Rear mounted round CMAK ML magneto. Forward mounted Miller DM3G short type dynamo with bearing housing visible. Oil feed to rear of cylinder.


8” front and rear, coupled with steel shoes.

Electrics (optional)

Miller 7” headlamp (bayonet fitting rim) with No 74E or later No 75 6-0-6 'Lighthouse' ammeter (illuminated) and 34E (early models). 39E or 39ER (latest models) rear lamp. Later machines used the No 74ES headlamp with the clip fitting rim. DM3G dynamo.


4 speed semi close ratio gearbox with hand change on RHS. Aluminium non-oil bath 2 part chain case with aluminium chainguard.


Amal type 29/109 with Binks twist grip control. Original settings: Main jet 170, slide 29/5, needle jet 109, needle position 3. Smiths Petroflex fuel line.

Exhaust system

Twin 1 3/4” low level pipes into Rudge ‘can’ type silencers and 6” fishtails.

Standard Fittings

Rear carrier (extra at no charge), 1”handlebars with folded type inverted levers and steering damper. Single toolbox fitted to offside of machine. Spanner adjusted fork shock absorber. Pressed steel centre stand. Open ended ‘D’ section forks.


Chrome plated petrol tank with black or maroon panels and black with maroon guards & tank panels. Smith’s trip/non trip speedometer, Smith’s 2" (2.4" diameter) 8 day clock in damper arm, Bonniksen speedometer, legshields, electric horn and Lucas No 63 bulb horn. Optional 2 lever control to carburetter.

© Colin Chapple


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©  Colin Chapple