The xxxx is an ID such as 723B and yyyyyy is the serial number 123456. The IDs were not unique to an engine type but were to indicate an engine variant and often a variant to a particular manufacturer (such as Sun, Norman, or Excelsior). The model, such as 32A, cover a wide number of IDs but generally give a farily tight definition of the engine design. For many of the later models (such as 9E 32A..) the engine ID and serial number has on a plate attached to the inner chaincase cover, during the passage of time these get replaced, so Villiers ensured that many engines would remain anonymous!
In general, the engine is a 249cc twin, bore & stroke 59 x 63.5mm fitted with a S22 carb.
Gear ratios for 4 speed box are 3.06, 1.90, 1.32, 1.00
This is one of the engines we have additional specific information on
Carb is S22/3 cutaway 2.5 mainjet 160
Siba Dynastart starter fitted, AZLu x 12/30-1200R unidirectional
At this moment such detailed additional information is not available for lookup online, in time it will.
The database contains post-WW2 motorcycle engines and some occasional extras, 1948 - 1966
In general, it does not contain any industrial engines, or pre-WW2 engines,
some generic data is available
* Engines
* Magnetos
* Search by marque