Aftermarket or bored pump nozzle, IHRA

IHRA answers this part for 29 of its classes. 4 of those answers permit the part outright and 5 permit it with stated conditions, leaving 20 that do not. 4 of the ones that do not are classes we read as open rather than as refusing it. 17 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 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 2 classes

Must remain OEM. May be modified or interchanged between models and years.

Drag, Yamaha Pro Stock · DD.1
Drag, Sea-Doo Pro Stock · DD.2

OEM part required 1 class

Must remain OEM. · W.5

Runabout Endurance

Not permitted, not listed in the rules 12 classes

On a closed list an unlisted modification is not permitted. · A.2.2, J.1

Not permitted, not listed in the rules 1 class

K.7.2 does not name the pump nozzle among the parts it opens to modification, and lists an aftermarket nozzle trim system, a steering part, rather than an aftermarket nozzle. Its 50 mm allowance on overall pump and nozzle length can be met through the housing, mounting plate or shoe, and boring is not listed here as it is in Ski GP3 at M.6.1.3. · A.2.2, J.1, K.7.2

Ski GP

Legal, with conditions 2 classes

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

Sport Spec · U.5.3
Runabout Limited · BB.9.3

Legal, with conditions 1 class

Yamaha SuperJet: nozzle angle modification. Kawasaki 800: OEM nozzle may be bored. · O.5.1

Ski Lites

Legal, with conditions 1 class

Kawasaki 750SX, Kawasaki SXR800: Nozzle may be bored. Pump stuffers may be added. M.6.1.3 Yamaha SuperJet (2-stroke): Nozzle may be modified for angle adjustment. · M.6.2.1.3

Ski GP3

Legal, with conditions 1 class

Model-dependent. The four-stroke nozzle is not listed in Four Stroke Ski Lites and so stays as supplied. A two-stroke entry may fit an aftermarket or modified nozzle under P.2.6, within the 50 mm overall length limit, which goes beyond the SuperJet angle change and Kawasaki 800 boring of O.5.1. · P.1, O.5.1, P.2.6

Ski Limited

Legal 4 classes

Aftermarket nozzles are permitted together with aftermarket pump assemblies, with no length limit stated in the class.

No rule, this is an open class 3 classes

The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.

No rule, this is an open class 1 class

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

Freestyle · CC

Aftermarket or bored pump nozzle: 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 9 of 29 answered, 5 with conditions