Engine unit 249 cc. Heavy duty JAP engine made exclusively for OK Supreme. New improved pattern crankcase, big end, cylinder and head, fully enclosed push rods, valve springs and valve gear. Phosphor bronze inlet valve guide positively lubricated. Valve enclosure quickly detachable making for simple adjustment of tappets. Wet sump lubrication by Pilgrim, mechanical pump. Carburation by Amal.

Gearbox Burman 4 speed, totally enclosed foot change – practical and simple to operate. Multiplate clutch for effortless changes.

Frame the new OK supreme all brazed dual-purpose frame, suitable for sidecar work. Steering excellent. Heavy single top and front down tubes. A & P TT tubing used throughout.Built in battery and oil tank mounting. Heavy tubular forks. Spring up rear and central prop stands.

Tanks Welded steel throughout. Petrol 3 gallons. Oil 3 pints capacity.

Equipment designed with a view to touring in comfort. Heavy ribbed mudguards specially strengthened for pillion work.

Lighting and ignition Lucas separate 30 Watt dynamo magneto. Large lamp and battery mounted in Hughes’ patent shock absorbing carrier.

Brakes 6 inch front and rear forged steel drums with finger adjustment.

Tyres heavy Dunlop 26 inches x 3.00 inches front and 26 inches x 3.25 inches rear.

Transmission chain throughout. The rear chain is lubricated by a cast aluminium oil sump with rubber inserts – an OK Supreme refinement. All other chains are running in oil.

General chromium plated handlebars with long levers, twist grip control.
Luxurious 3 point saddle and large knee grips, licence holder, electric horn.
Extra strong toolbox which opens out leaving a comprehensive kit of tools open to hand.
Low level exhaust pipe.

Finish
Cycle parts black enamel on anti-rust base.
Chromium plated petrol tank with
black panels, lined out in gold.
Rims and all bright parts chromium plated.

Code word "GLUXO"