Frame

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

Wheels

WM1x19 (f), WM1x19 (r). with identical hubs and black enamelled rims. Black spokes with NPB nipples. Bolt on rear sprocket.

Mudguards

Plain inverted U section 5.5” wide, unvalanced front and rear. Rear with detachable tail section. Tail section supported by wire stays.

Tanks

Petrol/oil tank finished in black and gold. Twin Westwood type fillers (oil & petrol) with front fitted petrol balance pipe. Single bolt damper arm fixing but no damper fitted. Brass lever petrol tap.

Engine

Numbered 1 to 700 - 4 valve 249cc with cast iron open valve radial cylinder head, bolted to the barrel from below. 18mm central plug. Miller coil ignition with contact breaker mounted in the timing cover. Oil feed to rear of cylinder. Ignition coil mounted across front of crankcase. Rear mounted short DM3 Miller dynamo.

Brakes

Both 6 3/4", coupled with steel shoes.

Electrics

Miller 7” headlamp with No 74E 6-0-6 'Lighthouse' ammeter and  39E rear lamp. Ignition tell tale mounted on handlebars with ignition rotary switch in headlamp rear. DM3G dynamo and Miller coil.

Transmission

4 speed gearbox with hand change on RHS of tank. Pressed steel primary cover with no inspection holes.

Carburetter

Vertical Amal type 5/142 with 2 lever control.

Exhaust system

Twin 1 3/8” low level pipes into Rudge ‘can’ type silencers (smaller than 500cc version) and 5” fishtails.

Standard Fittings

Non adjustable 1” handlebars with folded type inverted levers. Single toolbox mounted opposite battery carrier on nearside of machine. Pressed steel centre stand. Open ended ‘D’ section forks. No steering damper or fork shock absorber fitted.

Extras

Chromium plated tank with black or maroon panels and black with maroon guards and tank panel. Smith’s trip/non trip speedometer, Bonniksen speedometer, legshields, electric horn, Lucas No 63 bulb horn.

©  Colin Chapple