IJSBA · Driveline

Aftermarket nozzle trim system (pump-mounted), IJSBA

Distinct from hull trim tabs. Judged under the driveline rules, not the trim-tab rules.

This page is IJSBA only, and the bodies do not agree. The same part under UIM. Which one applies to you is decided by whoever sanctions the race you enter.

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This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter. If you race more than one series, build to the stricter answer. The differences are set out in the rulebook comparison.

Where it stands, class by class

20 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.

What each answer below means

Not permitted, not listed in the rules

Treat it as coming off. The class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list, so this is our reading rather than a rule we can quote at you.

The rules do not say

Unanswered. The rules do not settle this, so ask the club before you rely on it.

Legal, with conditions

Keep it, but measure it: the rules permit this part only inside stated limits.

Legal

Keep it. The rules permit this part in this class.

Not permitted, not listed in the rules 7 classes

Not listed in this class document. Illegal under the closed-list principle.

• Fixed Steering Ski Stock · FSSK
• Runabout Rec Lites · RRL
• Ski Stock · SSK
• Vintage Ski Limited · VSKL
• Four Stroke Ski Lites · FSKL
• Runabout Stock · RAS
• Ski Lites · SKL

The rules do not say 1 class

Not addressed in this class document.

• Ski Modified · SKM

Legal, with conditions 1 class

Two-stroke only.

• Runabout Naturally Aspirated · RNA

Legal 11 classes

The driveline clause allows aftermarket nozzle trim systems.

• Sport Spec · section headings, no numbered rules
• Runabout Limited · RAL.9.1
• Ski Superstock · SKSS.6.1
• Vintage SC · VSC.6.2
• Vintage X2 · VX2.6.2
• Runabout Superstock · RSS.10.1
• Vintage Ski · VSK.6.2
• Freestyle · FREST.6.1
• Ski Grand Prix · SKGP.10.1
• Sport GP · SPGP.10.1
• Runabout Open / GP · ROP.9.1

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Aftermarket nozzle trim system (pump-mounted): if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.

Every IJSBA class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.