Rulebook reference

IJSBA

International Jet Sports Boating Association. Primarily North America and the IJSBA affiliate network. The 2025 rulebook, published as 25 separate PDFs, rule years 2021-2025. Homologation at 500 units, sound measured at 22.86 m.

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These classes are not all from the same season. This body publishes a document per class and they carry different rule years, so two classes here can disagree because they were written several seasons apart. Each class page names its own year. Comparing two of them is not comparing one rulebook with itself.

ski

• Fixed Steering Ski Stock

  Has its own rules · FSSK · 2025 rulebook · 4 open questions

• Ski Stock

  Has its own rules · SSK · 2025 rulebook · 4 open questions

• Four Stroke Ski Lites

  Has its own rules · FSKL · 2025 rulebook · 4 open questions

• Ski Lites

  Has its own rules · SKL · 2024 rulebook · 4 open questions

• Ski Modified

  Has its own rules · SKM · 2024 rulebook · 5 open questions

• Ski Superstock

  Has its own rules · SKSS · 2025 rulebook · 4 open questions

• Ski Grand Prix

  Has its own rules · SKGP · 2025 rulebook · open class · 5 open questions

runabout

• Runabout Rec Lites

  Has its own rules · RRL · 2022 rulebook · 4 open questions

• Runabout Naturally Aspirated

  Has its own rules · RNA · 2025 rulebook · 3 open questions

• Runabout Stock

  Has its own rules · RAS · 2024 rulebook · 3 open questions

• Runabout Limited

  Has its own rules · RAL · 2022 rulebook · 4 open questions

• Runabout Superstock

  Has its own rules · RSS · 2025 rulebook · 3 open questions

• Runabout Open / GP

  Has its own rules · ROP · 2024 rulebook · open class · 3 open questions

vintage

• Vintage Ski Limited

  Has its own rules · VSKL · 2025 rulebook · 4 open questions

• Vintage SC

  Has its own rules · VSC · 2022 rulebook · open class · 3 open questions

• Vintage X2

  Has its own rules · VX2 · 2023 rulebook · open class · 4 open questions

• Vintage Ski

  Has its own rules · VSK · 2025 rulebook · open class · 5 open questions

sport

• Sport Spec

  Has its own rules · none - this document uses ALL-CAPS section headings, not numbered rules · 2024 rulebook · 6 open questions

• Sport GP

  Has its own rules · SPGP · 2025 rulebook · open class · 5 open questions

freestyle

• Freestyle

  Has its own rules · FREST · 2025 rulebook · open class · 4 open questions

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Read the 2025 rulebook · Where the rulebooks differ · Signed checks on parts the shop sells

Classes are one way in. To start from the part instead, and see how many classes answer it, legality by part lists every part any of the three rulebooks addresses.