Diamond Motorcycles

Diamond Motorcycles 1923

The 1922 Olympia Show.

DIAMOND. (93.)

Sleeve Valve or Two-stroke Models.

3½ H.P. Model.

  • 79x70 mm. (343 c.c); one cyl. two-stroke; drip feed lubrication; Amac carb.; fly wheel-driven mag.; 3-sp. gear; clutch and kick-starter; chain drive; 26x2¼in. tyres. Price £60.

The D.F. and M Engineering Co., Ltd., Diamond Works, Wolverhampton.

Visitors to this stand will find three different and well-known types of engines, one of which is a two-stroke (the Villiers); another, the well-known standard J.A.P. with side valves, found on so many medium-weight machines; and, last, the Barr and Stroud single-cylinder sleeve-valve engine of 349 c.c. capacity. In each case the power plant is adapted in a remarkably neat and attractive manner. The Sturmey-Archer two-speed gear and Amac carburetter are fitted to machines with the Villiers and J.A.P. engines. A smaller model, also with Villiers engine, may be described as an ultra-lightweight machine. This is fitted with the Albion two-speed gear, and will appeal particularly to those who require a mount that is both substantial and tractable, whilst being at the same time really light.

3½ H.P. Model.

  • 70x90.5 mm. (349 c.c.); one cyl. four-stroke; single-sleeve valve; sight feed lubrication; Amac carb.; chain-driven magneto; 3-speed gear; clutch and kick-starter; chain drive; 26x2¾ tyres. Price £77 10s.

Probably the most interesting model on this stand is that fitted with the 349 c.c. Barr and Stroud sleeve-valve engine; it is chain-driven throughout. The magneto is an M.L., and a Sturmey-Archer three- speed gear is employed. The brake work is well carried out, dummy belt rims being fitted on both front and rear wheels. Altogether this is a most attractive model, and merits close study. In the case of the types fitted with Villiers two-stroke engines, a choice of three varieties is given, i.e. the 150 c.c. ultra-lightweight already mentioned, together with the 250 c.c. and 350 c.c. types. The larger model is fitted with Sturmey-Archer three-speed gear. This or the sleeve valve engined machine is suitable for sidecar work.

Olympia Show 1922 The Motor Cycle, November 30th, 1922. Page 850



If you have further information or a query related to this page, please contact us

Boxer Performance
Boxer Performance
Increased torque and peak power for BMW Twins.