Andy wrote:

paul g wrote:
It was part of the 80's craze for gizmos and acronyms, Yamaha were big into boost bottles and called them YEIS if I remember correctly Yamaha energy induction system.

Like this, you mean?!

Exactly like that, an acronym for evrything . My favourite was on the 1985 Yz range called BASS brake activated suspension system. The back brake had a spring attached to the Shock that changed the damping under braking to stop the back chopping about under braking. Most people disconnected it after the first ride and it was discretely dropped the following year