IHRA · Driveline

Aftermarket impeller, IHRA

IHRA answers this part for 29 of its classes. 7 of those answers permit the part outright and 21 permit it with stated conditions, leaving 1 that do not.

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

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.

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.

OEM part required 1 class

Must remain OEM. May NOT be modified in any way including re-pitching. EXCEPTION: Kawasaki 300/310 may modify or use aftermarket provided the original diameter is maintained. · W.5.2

• Runabout Endurance

Legal, with conditions 21 classes

May be modified or replaced with an aftermarket part. The original diameter must be maintained in Stock class, and the rulebook never defines which classes that is. · J.18.2

• Runabout Lites
• Four-Stroke Ski Lites
• Runabout GP2
• Runabout GP3
• Ski GP2
• Ski Lites
• Drag, Yamaha Spec
• Ski GP3
• Ski Limited
• Drag, Sea-Doo Spec
• Runabout Limited
• X2 Vintage
• Ski Vintage
• Drag, Super Stock
• Freestyle
• Ski GP
• Sport GP
• Drag, 2 Stroke Unlimited
• Drag, Stand Up Unlimited
• Drag, Unlimited
• Drag, Turbo No Nitrous

Legal 3 classes

Aftermarket propellers permitted.

• Drag, Sea-Doo vs Sea-Doo · DD.11
• Drag, Yamaha Pro Stock · DD.1
• Drag, Sea-Doo Pro Stock · DD.2

Legal 2 classes

Aftermarket impellers are allowed alongside aftermarket housings, stator vanes, mounting plates and pump shoes, with no diameter or pitch limit stated.

• Ski 1100 Modified · R.5.3
• Ski 1500 Modified · Q.5.3

Legal 1 class

Impellers may be altered or aftermarket, while the stator vane assembly must stay OEM stock. · U.5.3

• Sport Spec

Legal 1 class

The impeller may be modified or aftermarket along with the housing, stator vanes, mounting plate and nozzle. · X.6.4

• Runabout GP

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Aftermarket impeller: 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.