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I'd say it is more correct to refer to this component as the 'single wound' spring type - I don't really think that they were 'high energy', from what I recall of using them, back in the day.
G'day Gadge
Many thanks for that - I will refer to them as single wound from now on.
My reference was to the energy released when incorrectly
[and ill-advisably] removed from the casing.

I guess the trip release springs had fewer turns of a thicker multi-wound
spring. These springs were safe to remove from their casing, and required
little effort to 'wind-in' a new spring. The casing also acted as the pawl
carrier - a serviceable part in itself.

I note the KX-B, using the Villiers 4-stroke, used the trip-release
design, not the earlier 'single would' style.

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Cheers
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Jack