1930 Ulster grand Prix



WM1x21 (f), WM1x21 (r). interchangeable with black enamelled rims. Rear with separate rear sprocket carrier assembly. (dogged drive).


5” D section, unvalanced, front and rear. Rear with detachable tail section.


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


4 valve 499cc with cast iron open valve cylinder head, parallel inlet valves and parallel exhaust. Splayed exhaust ports.18mm side plug. Rockers supported on plates bolted to the cylinder head. 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.


Dummy belt rim front and rear, coupled to RH pedal.
Electrics (optional)
6V or 4V ML.


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


Amac with Amac 2 lever control


Twin 1 1/2” nickel plated short downpipes into horizontal steel expansion chamber mounted in front of crankcase. Single tail pipe to rear wheel ending in detachable fishtail.


Rear carrier,7/8” non adjustable handlebars with folded type inverted levers. Rear stand. Leather fronted toolbox mounted on rear carrier on nearside of machine. Steering damper operated by wing nut through the steering head. Battery carrier (where fitted) mounted on offside of machine to the rear of the gearbox. Leather topped pan type saddle. Closed ended ‘D’ section forks.


Rear brake lock for use when a sidecar is fitted. Footboards.

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