Engine unit 249cc OHV engine made by JAP exclusively for OK Supreme. Bore 62.5mm stroke 80mm – high compression piston with new big end to suit. Entirely new cylinder and head specially designed with a view to cool quiet running. The head ports, flywheels and con-rods are polished. Phosphor bronze inlet valve guide, needle roller rocker bearings. Valve springs and valve gear totally enclosed and positively lubricated by Pilgrim mechanical pump. Carburation by Amal. Each engine tuned to give maximum performance.
Gearbox 4 speed totally enclosed, with short travel foot change, specially designed for us by Burman. 3 plate clutch with Ferodo linings as option.
Frame road holding and steering superb at all speeds. A & P TT tubing with brazed joints throughout. Crankcase under shield fitted to cradle. Spring up rear and central prop stand. Hughes’ battery carrier and oil tank built on to seat tube.
Tanks all welded steel. The bold 3 gallon tank is of the 4 point fixing type mounted on rubber. 3 pint oil tank built on to frame.
Equipment of extra quality throughout. Heavy central ribbed mudguard with tubular lifting handle, rear fitted with extra stays for backrest or pillion seat.
Brakes 6 in front and rear with road racing linings and finger adjustment.
Lighting and ignition 30 watt separate dynamo magneto. The dynamo and lights easily detachable.
Transmission chains throughout – primary, dynamo and magneto chains all running in oil bath.
General chromium plated handlebars with large levers and twist grip control. Dunlop 26 inches x 3 inches ribbed front and 26 inches x 3.25 inches studded rear tyres. Welded steel toolbox with a complete set of tools. Electric horn, licence holder, large knee grips fitted as standard. Upswept exhaust pipe fitted as standard. But, low level optional.
Finish cycle parts enamelled in black, with gold lines on the guards. Rims and bright parts chromium plated. Tank chromium plated with black and gold lines. GOOD FOR 70MPH. Code word "GESOV"
SPORTS 70 Model GT70/36 As on model G70/36 only with 3 speed gearbox and 26 inches x 3 inches tyres. If required with 26 inches x 3.25 inches rear tyres extra.
Extras: competition tyres; chromium tank; pillion seat; foot rests; back rests and dome piston complete.
Code word "GETOR"
Source: ok-supreme-muv archive
