IHRA · Driveline

Aftermarket impeller

IHRA answers this part for 29 of its classes. 28 of those answers are permissions, with or without limits attached, and 1 are not.

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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, and where both govern you, you are held to the stricter of the two. The differences are set out in the rulebook comparison.

Where it stands, class by class

29 classes, grouped by the answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.

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, within limits 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 5 classes

Aftermarket permitted.

• Sport Spec · U.5.3
• Drag, Sea-Doo Pro Stock · DD.2
• Ski 1100 Modified · R.5.3
• Ski 1500 Modified · Q.5.3
• Runabout GP · X.6.4

Legal 2 classes

Aftermarket propellers permitted.

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

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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 · signed checks on parts the shop sells.