Martinsyde. (Stand 141 a.)
6 h.p.; 70x88 mm. (680 c.c.); V twin four-stroke; overhead exhaust valves; drip-feed lubrication; Amac carburetter; M-L chain-driven magneto; three-speed A.J.S. pattern gear; enclosed chain drive; Dunlop 650x65 mm. tyres. Price with sidecar £175.
Martinsyde, Ltd., Mayberry Hill, Woking.
Two sidecar taxis and a light delivery outfit (with an interchangeable "pleasure" body, by the way) will not obscure the public eye to the excellent value offered on this stand in both the standard and de luxe sidecar outfits. Of equal interest is the fact that a maximum price has been fixed for the ensuing year. Now celebrating its first birthday, the 6 h.p. Martinsyde has, as was expected, made a distinct hit. Slight modifications ensuring a smoother passage for the gas have been carried out around the over-head exhaust pockets, and improved cooling has been arranged. The inlet valves remain of the more usual "side-by-side" type, but aeroplane engine influence is discernible in the split ring method of holding the gudgeon pin. By slightly increasing the diameter and width of the rear band brake drum, the retarding effect has been considerably increased. Totally enclosed chain drive takes the power from a gear box of A.J.S. pattern to the rear wheel. Equal to anything at the Show in the completeness (Lucas Magdyno, interchangeable wheels, etc.) of its equipment, if not in price, the de luxe model should appeal to the most fastidious.
3½ h.p.; 60x88 mm. (497 c.c; V twin four-stroke; overhead exhaust valves; drip feed lubrication; Amac carburetter; M-L chain-driven magneto; three-speed A.J.S. pattern gear; chain drive; Dunlop 26 x2½ in. tyres. Price £135.
Making its début at this Show, the 3½ h.p. solo mount has evidently been built with one eye on efficiency and the other on speed. Much of the engine is common to the larger model, and in appearance and design it is identical. A gear box of the same type is used, although the frame, of course, is lighter and shorter. Worthy of special attention, both here and on the "six," is a quickly detachable aluminium cover completely enclosing the magneto. Careful provision has been made to ensure that both cylinders receive an equal share of attention from the oil tank.
The Motor Cycle, December 2nd, 1920. Page 701