FSA

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Formula Super A

FSA (Formula Super A) is the highest CIK/FIA class for 100cc rotary valve non-gearbox, direct drive engines as it was run from (and including) 1993, when it replaced Formula K (FK), up until (and including) the 2006 season, after which the arrival of the 125cc KF classes spelled its demise.
FSA (Formula Super A) was largely the same as FA (Formula A), except in Super A the regulations were more lenient on tuning of certain areas of the engine.
FSA was the official CIK/FIA world championship class.