Frame

Numbered 9600 to 18456 (approx). Bolt on seat stays with drawback type chainstays for rear wheel adjustment.

Wheels

650 x 65mm beaded edge. interchangeable with black enamelled rims. Black spokes with NPB nipples. Rear with separate rear sprocket carrier assembly. (dogged drive).

Mudguards

5” D section, unvalanced, front and rear.

Tanks

Petrol tank with double gold lined panels fitted between frame rails (flat tank). Single 2" external screw type filler. Brass lever petrol tap. Oil tank mounted on rear frame down tube across the frame with spring loaded filler to offside.

Engine

Numbered 31500 to 39499 (approx) - 4 valve 499cc with cast iron open valve cylinder head, parallel inlet valves and parallel exhaust. Forward facing parallel exhaust ports.18mm side plug. Rockers supported on cast support with clamps to rocker spindles. Forward mounted ML Maglita or round ML magneto. Square based cylinder barrel and plain drive side crankcase. Total loss oiling with Best & Lloyd pump mounted on timing cover.

Brakes

Dummy belt rim front and rear, coupled to RH pedal.

Electrics (optional)

4V ML lighting available. Headlamp mounted on spoke wire supports. Lighting control mounted on  top frame rail. 6V lighting set provided for export models.

Transmission

4 speed gearbox with hand change on RHS of tank. Gearbox with external kickstarter stop. Steel primary chain cover and ‘angle iron’ type chainguard.

Carburetter

Senspray with Senspray 2 lever control

Exhaust system

Twin 1 1/2” nickel plated short down pipes into horizontal steel expansion chamber mounted in front of the crankcase. Tail pipe to rear wheel.

Standard Fittings

7/8” non adjustable handlebars with folded type inverted levers. Rear stand. Leather fronted toolbox mounted on rear carrier on nearside of machine. Battery carrier (where fitted) mounted on offside of rear carrier. Leather topped pan type saddle. Closed ended ‘D’ section forks. 17" tyre pump.

Extras

Footboards

©  Colin Chapple