John Allen and Sons used a number of engine types, the most common being a Villiers two-stroke with magneto ignition and rope start.
It is notable that these vehicles were all powered by a 49 cc 2-stroke engine, while Honda has a long history of producing 49 cc 4-stroke mopeds and light motorbikes.
A Kramer graph is a specific multiple-line 2D geometric symbolic representation of the characteristics of intake, scavenging and exhaust components in a two-stroke cycle engine.
It is frequently used as a supercharger in engines, where it is driven directly from the engine's crankshaft via a belt or, in a two-stroke diesel engine, by spur gears.
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Designed by Sir Alliot Verdon Roe in 1926, the Ro-Monocar used a 250cc Villiers two stroke engine, and featured a high degree of enclosure for the rider and a bucket seat.
The SS20 Cervo was mainly a JDM model (although it was also sold as a LHD in Chile) with a 539 cc three-cylinder, two-stroke engine.