IJSBA · Driveline

Titanium driveshaft, impeller housing or stator vane assembly, IJSBA

A material rule, not a part rule. Explicitly banned in several classes.

This page is IJSBA only, and the bodies do not agree. The same part under IHRA and 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 legal

This comes off. The rules refuse it in this class.

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 legal 4 classes

No titanium driveshaft, impeller housing or stator vane assembly may be used.

• Runabout Limited · RAL.9.1
• Vintage SC · VSC.6.1
• Vintage X2 · VX2.6.1
• Runabout Superstock · RSS.10.1

Not legal 1 class

Two-stroke.

• Runabout Naturally Aspirated · RNA

Not legal 1 class

Titanium driveshafts prohibited.

• Sport Spec · section headings, no numbered rules

Not permitted, not listed in the rules 8 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
• Four Stroke Ski Lites · FSKL
• Runabout Stock · RAS
• Ski Lites · SKL
• Ski Modified · SKM
• Ski Superstock · SKSS

The rules do not say 1 class

No titanium prohibition stated, but no permission either. Titanium FASTENERS are prohibited unless originally equipped.

• Vintage Ski Limited · VSKL

Legal, with conditions 4 classes

Couplers, bearing housing and driveshaft may be modified or aftermarket provided they keep a 1:1 drive ratio between the engine and the pump. The clause names no material, so a titanium shaft is covered by it.

• Freestyle · FREST.6.2
• Ski Grand Prix · SKGP.10.2
• Sport GP · SPGP.11.2
• Runabout Open / GP · ROP.9.2

Legal 1 class

Titanium driveshaft, impeller housing or stator vane assemblies ARE permitted in Vintage Ski. This is the opposite of X2 and SC and worth verifying.

• Vintage Ski · VSK

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What we corrected here, and when

• Freestyle. Corrected 2026-10-01: this row read as unanswered until FREST.6.2 was read against it.
• Runabout Open / GP. Corrected 2026-10-01: this row read as unanswered until ROP.9.2 was read against it.
• Ski Grand Prix. Corrected 2026-10-01: this row read as unanswered until SKGP.10.2 was read against it.
• Sport GP. Corrected 2026-10-01: this row read as unanswered until SPGP.11.2 was read against it.

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Titanium driveshaft, impeller housing or stator vane assembly: 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.