Engine unit 348cc OHV engine made by JAP exclusively for OK Supreme. Bore 70mm stroke 90mm. Downdraught carburettor by Amal. Single port, sturdy big end assembly. Wet sump lubrication by Pilgrim mechanical pump. Fully enclosed push rods valve springs and valve gear positively lubricated. Fitted with quickly detachable covers to facilitate adjustment. All parts carefully machined to the finest limits to ensure maximum performance.
Gearbox 4 speed totally enclosed, with short travel foot change, by Burman. Multi- plate clutch.
Frame the new OK Supreme semi-cradle type of all brazed with heavy front down tube. A & P TT tubing and design of extreme sturdiness, eminently suitable for side-car work. Steering and roadholding both at high speed or in a mud section superb. Built in battery and oil tank. Tubular forks with steering damper and shock absorbers.Spring up rear and central prop stand.
Tanks bold but neat design and both of welded steel. Petrol tank 3 gallon and 3 pint oil tank.
Equipment very comprehensive and of best possible quality. Heavy central ribbed mudguards adequately supported for pillion work.
Brakes 6 inches front and rear giving positive braking.
Lighting and ignition Lucas 30 watt magdynamo with large battery mounted in a Hughes’ shock absorbing battery carrier.
Transmission chains throughout. Rear chain positively lubricated by OK Supreme patent. Other chains running in oil.
General chromium plated handlebars. Large Terrys’ saddle. Large toolbox with full kit of tools, licence holder, electric horn and knee grips. Low level exhaust pipe. All controls adjustable.
Finish cycle parts enamelled in black with gold lines. Rims and bright parts chromium plated. Tank finished in attractive colours.
Finish black enamel on anti-rust base. All bright parts chromium plated. Tank attractively finished in colour.
Extra chromium tank as illustrated.
Code word "HEATY"
Source: ok-supreme-muv archive
