P&M 1911 500cc 1 cyl sv



P&M   1911  3  ½  HP   498 cc  single  frame # 3636  engine # 3636S

Phelon & Moore (P&M) was founded in Cleckheaton, South Yorkshire in 1904.
Joah C. Phelon, partner with Harry Rayner in a small engineering business in the town, had built his first prototype motorcycle in 1900, the rights to which were bought by the Humber company.
Following Rayner’s untimely death in 1903 Phelon entered into a fresh partnership with Richard Moore.
Phelon’s first designs had featured engines with inclined cylinders forming part of the frame, and this trademark arrangement was continued by the newly formed P&M.
One of the fledgling firm’s first developments was a two-speed primary gear consisting of a pair of chains and a selective clutch, which would remain a P&M feature into the early 1920s. 
Mainstay of production prior to WWI was a 3½hp single that would be progressively developed, gaining magneto ignition, a contracting band rear brake, P&M’s own front fork and a mechanical inlet valve as the years passed.  
In 1911 three models were available, the standard 3 ½ HP Touring Model (with bore x stroke of 82×88 mm, giving 465 cc), a Colonial Model with extra large tank,  rear chain guard, heavier tyres and extra girders to forks and a 2 ½ HP Light Model  with a capacity of 260 cc and automatic  inlet valve.
By 1914 the rear chain was completely enclosed ( standard models up to 1913 had no rear chain guard), the two speed gear was also fully protected by a closed cover and the front mudguarding had become more elaborate: the 1914 3 ½ HP weighed  25 lbs more than its 1911 counterpart. 
An interesting feature of this charming early P&M  is  the tool bag fitted in the frame,  which was an genuine P&M fitting.
In 1913 a new 3 ½ HP  engine was presented with bore and stroke dimensions of 84.5 X 89 mm.
This engine was nominally rated at 3  ½  HP but actually delivered up to 5 HP.  
This improvement was carried out to meet the increasing demand for sidecar mounts. 
When war broke out in August 1914, the 3½hp P&M, which had been undergoing assessment by the War Office prior to the commencement of hostilities, was chosen as official motorcycle transport for the newly formed Royal Flying Corps. 
This early P&M is an older restoration and she’s fitted with a somewhat younger engine.