Various letter suffixes were added to indicate model variation to suit local regulations, such as the FS1-E for England, FS1P/DX NL and others.

The Yamaha FS1-E has a 49 cc (3.0 cu in), single cylinder, two-stroke, air-cooled, rotary disc-valved engine with a four-speed gearbox.

An award-winning short film was produced in 2006 and is available entitled 'Fizzy Days' encompassing the bikes and the era.

[citation needed] The FS1-E had the ability to be powered by pushbike type pedals since this was a legal requirement for registration as a moped in the United Kingdom and some other European countries at the time.

Electrics : Magneto ignition with integral 6V AC for the main running lights (including high and low beam on a switch).

They had a similar speed, and thanks to their 4-stroke design were cleaner, more economical and potentially longer lived though without quite the same acceleration.