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Class Legality

IHRA · Driveline

Aftermarket pump housing and stator vanes, IHRA

IHRA answers this part for 29 of its classes. 4 of those answers permit the part outright and 8 permit it with stated conditions, leaving 17 that do not. 4 of the ones that do not are classes we read as open rather than as refusing it. 13 are inferred from how the class is written rather than quoted from a rule naming this part.

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

Where it stands, class by class

29 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

OEM part required
This comes off. Only the part the manufacturer fitted is allowed here.
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.
No rule, this is an open class
Probably keep it. The class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms, and this is our reading rather than a permission anybody wrote down.

OEM part required 1 class

U.5.3 keeps the stator vane assembly OEM stock and names no aftermarket impeller housing. The housing changes it allows are OEM ones: an OEM plastic housing on the Sea-Doo HX with the small-diameter hub and vane count kept, and the factory-superseded six-vane pump on the Polaris Hurricane. A Kawasaki X2 may fit aftermarket pump cones, and the pump and nozzle assembly may grow by no more than 50 mm. · J.1, U.5.3

Not permitted, not listed in the rules 1 class

K.7.2 lets the OEM impeller, pump housing, stator, mounting plate and pump shoe be modified, with the pump and nozzle assembly up to 50 mm longer than OEM, but it names no aftermarket housing or stator, although K.2.4 and K.5.1 in the same section say aftermarket in terms. Under J.1 a replacement part must be expressly allowed, and K.7.2 allows modification only. · A.2.2, J.1, K.7.2

Legal, with conditions 2 classes

The pump and nozzle assembly may extend no more than 50 mm beyond OEM.

Legal, with conditions 1 class

Model-dependent. Four Stroke Ski Lites gives a four-stroke entry no pump allowance, so its housing and stator stay closed, while P.2.6 lets a two-stroke entry fit an aftermarket or modified impeller housing, stator vane assembly, mounting plate, pump shoe and nozzle, with the pump and nozzle assembly no more than 50 mm longer than OEM. · P.1, P.2.6, J.1

Legal, with conditions 1 class

Titanium impeller housings and stator vane assemblies allowed. Limits: max extension from transom 139.7 mm. · S.5.2

Legal, with conditions 1 class

Limits: max nozzle extension 50 mm. · V.8.3

Legal, with conditions 1 class

Limits: max assembly extension 50 mm. · X.6.4

No rule, this is an open class 1 class

No restriction in section CC, and CC.1 permits any modification it does not restrict.

Aftermarket pump housing and stator vanes: 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 IHRA class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.

Driveline · two and four stroke · legal in 12 of 29 answered, 8 with conditions

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