ENGINE UNIT 498cc OK Supreme high camshaft engine, bore 83mm . Chain driven camshaft with tensioner, running in oil. Short enclosed duralumin push rods, short straight rockers and phosphor bronze rocker bearings. Totally enclosed valves and valve guides positively lubricated. High compression piston, polished head, ports, flywheel and con-rod. Sturdy big end in duralumin cage. Roller and ball bearings to driving side and ball bearings to timing side. Downdraught carburettor by Arnal. Single port. Engine shock absorber fitted. Individually tuned for maximum performance.
GEARBOX Burman 4 speed with enclosed short travel foot control. 4 plate clutch with Ferodo linings at option. Special lead to dogs ensuring positive change.
FRAME all brazed cradle type of tested road holding and steering qualities as used on all OK Supreme road racing machines. Pivot gearbox mounting, ensuring easy adjustment. Integral sidecar lugs. Tubular mounted stays and lifting handle. All A & P TT tubes and lugs of best material.
TANKS commodious petrol and oil tanks of best welded steel, "push on" taps together with reserve.
EQUIPMENT heavy central ribbed mudguards specially strengthened for heavy work.
LIGHTING & IGNITION Lucas 30 watt magdyno.
TYRES 26 inches x 3.50 inches rear and 26 inches x 3.25 inches front heavy Dunlops.
TRANSMISSION chain throughout, primary, camshaft and magneto, chains all running in oil. Primary oil bath of cast aluminium.
GENERAL chromium plated handlebars with long levers, twist grip control. Large Terrys saddle, knee grips, Altette horn and licence holder. Complete set of tools. Sports exhaust pipe.
FINISH of sporting appearance with a bold and attractive tank lined out in gold. Cycle parts black, rims and other bright parts chromium plated.
Code word "SPLON"
SPORTS 90 Model R/36
As model S/36 but with low compression piston and without extra tuning. An admirable touring machine.
Code word "ROVER"
Source: ok-supreme-muv archive
