Acronym #1. EXUP.

Acronym #1. EXUP.
EXhaust Ultimate Power valve.
The EXUP was the first four stroke power valve developed by Yamaha an the system appeared first time on a 1987 Yamaha FZR400R and was later used in many Yamahas (my MT-01 have it for an example), when the Yamaha EXUP patent expired many other manufacturers mounts their versions of the EXUP valves like Honda on the CBR´s , Suzuki on Gixxers or Triumph on the Daytonas.

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