The ES2 was first introduced into the Norton range in 1928. It shared it's cycle parts with the CS1 but had an OHV engine and was made throughout it's existence with a more up to date specification to the Model 18. 1939 saw the introduction of plunger rear suspension as an optional extra but this was short lived as the ES2 was dropped from production during WW2. When re-introduced after the war, plunger rear suspension and telescopic Roadhoalder forks were standard. In 1948 the engine received a major redesign including and oil feed to the rocker box, stronger timing side crankcases and largely improved valve train. 1950 saw the of the Laydown gearbox. This reduced the travel on the lever which make for an easier box to use, but does nothing to limit the persistent oil leaks. The ES2 shown here is a 1951 Model so comes in the specification just mentioned. Later updates included a larger petrol tank, swinging arm rear suspension (pre-featherbed, wideline and slimline frames where all used), alloy cylinder heads and alternator/coil electrics to name a few.

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