Engine unit the now famous OK Supreme 249cc overhead camshaft designed and built in our works. Rocker box of unique design. Incorporating ideal rocker bearings and cams running in uniform oil well - dispenses with oil leaks. Down draught carburettor by Amal. Single exhaust port. Cylinder head barrel and rocker box may be removed without disturbing the valve or ignition timing. Heat treated aluminium alloy piston. Sturdy roller bearing big-end with duralumin cage, steel flywheels. Double row ball bearings to driving side, single ball bearings to timing side. Bevel driven cams, dry sump lubrication with pressure feed to big end, rockers, bevels and valve guides. Engine shaft fitted with shock absorber.
Gearbox 4 speed totally enclosed with short travel foot change, specially designed for us by Burnam. Multi-plate clutch with Ferodo linings at option.
Frame road holding and steering superb at all speeds. A and P T.T. tubing 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 type mudguard with tubular lifting handle, rear fitted with extra stays for back rest or pillion seat.
Brakes 6 inches front and rear with road racing linings, finger adjustment.
Lighting and ignition 30 watt magdynamo and lights easily detachable.
Transmission chains throughout, primary dynamo and magneto chains all running in an 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 tyre. Welded steel toolbox, with complete set of tools. Electric horn, licence holder, large knee grips fitted as standard. Upswept exhaust pipe fitted as standard but low level optional.
Code word "TRIAL"
Source: ok-supreme-muv archive
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