The power band of a 1967 Suzuki RK67. It occupied the 500 rpm between 17,000 and 17,500.

The engine, then, went something like this:

Splutter

Splutter

Splutter

Splutter

Splutter

Wheeee

Bang

To make use of the milliseconds between splutter and bang required the use of one of these, a thing rarely seen

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Yes, a fourteen speed gearbox.