Aftermarket pump/impeller housing, stator vane assembly, pump shoe, IJSBA

The clean line between a stock-class pump and a race pump.

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.

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.
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 6 classes

No internal modification of driveline components including pump stator and reduction nozzle.

Fixed Steering Ski Stock · FSSK.6.2
Runabout Rec Lites · RRL.6.2
Ski Stock · SSK.6.2
Four Stroke Ski Lites · FSKL.6.2
Runabout Stock · RAS.10.2
Ski Lites · SKL.6.2

Not permitted, not listed in the rules 1 class

NOT listed as modifiable in VSKL. Under the closed-list rule these must remain OEM. Flagged as a commercially significant open question.

Vintage Ski Limited · VSKL

Legal, with conditions 1 class

TWO-STROKE craft only. Four-stroke craft get impeller and wear ring only.

Runabout Naturally Aspirated · RNA

Legal, with conditions 1 class

STATOR VANE ASSEMBLY MUST REMAIN OEM STOCK. Pump mounting plate and shoe may be aftermarket. Sea-Doo HX may use the OEM plastic pump housing if it retains the small-diameter hub and vane count.

Sport Spec · section headings, no numbered rules

Legal, with conditions 1 class

Must be from an IJSBA-APPROVED aftermarket manufacturer. · SKM.9.1

Ski Modified

Legal 5 classes

The impeller housing, stator vane assembly, pump mounting plate and pump shoe may be modified or aftermarket, with the complete pump and nozzle assembly no more than 50.00mm (1.97 in.) longer than original.

Ski Superstock · SKSS.6.1
Freestyle · FREST.6.1
Ski Grand Prix · SKGP.10.1
Sport GP · SPGP.10.1
Runabout Open / GP · ROP.9.1

Legal 4 classes

The impeller housing, stator vane assembly, pump mounting plate and pump shoe may be modified or aftermarket but not in titanium, and the complete pump and nozzle assembly may be no more than 50.00mm (1.97 in.) longer than original.

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

Legal 1 class

The impeller housing, stator vane assembly, pump mounting plate and pump shoe may be modified or aftermarket, titanium included; the overall length sentence is misprinted and appears to cap the pump and nozzle assembly at 139.7mm (5.5 in.) from the transom. · VSK.6.1

Vintage Ski

Aftermarket pump/impeller housing, stator vane assembly, pump shoe: 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.

Driveline · two and four stroke · legal in 13 of 20 answered, 3 with conditions