Matchless G45 500cc Racing Vertical Twin. Vertical twin cylinder engine of 498 c.c. capacity, light alloy cylinders and cylinder heads, twin camshafts, push rod operated valves. Two Amal Grand Prix carburettors, Lucas racing magneto. Maximum power is developed at 7.100 - 7.200 r.p.m. (not less than 50 b.h.p. on 82 octane petrol). Fully sprung duplex cradle frame, light alloy mudguards and tanks. Magnesium alloy wheel hubs, straight spokes and 8½ inch brakes. 3.50 x 19 inch rear and 3.00 x 19 inch front wheels. Dunlop racing tyres. Smith's rev. counter; two-piece adjustable handlebars. Quick action filler caps. Fully equipped for use in races under F.I.M. Regulations.