OEM part required 1 class
No modifications. Existing holes must be replaced with OEM uncut panels. Center wall may be removed. Exterior bumpers not required. · DD.1
IHRA · Hull and handling
Aftermarket or modified top deck, IHRA
IHRA answers this part for 29 of its classes. 2 of those answers permit the part outright and 4 permit it with stated conditions, leaving 23 that do not. 3 of the ones that do not are classes we read as open rather than as refusing it. 19 are inferred from how the class is written rather than quoted from a rule naming this part.
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
No holes are permitted, and any existing hole must be replaced with an OEM uncut panel. · DD.2
OEM part required 1 class
Must remain OEM. No modifications permitted. · DD.3
OEM part required 1 class
Deck modifications must not exceed the original deck length. · T.6.4
Not permitted, not listed in the rules 16 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
Legal, with conditions 1 class
The top deck must stay OEM, so no aftermarket deck may be fitted, but DD.4 lets it be lightened and drilled for more air. · DD.4
Legal, with conditions 1 class
Must resemble an OEM homologated top deck: handle pole attachment forward of the hood, ride tray aft of it, raised gunnels each side of the tray. Hull may be no smaller than the minimum measurements of the top deck. Deck and hull joined by the original method. No part of the hull, deck, or handle pole may be tethered or fastened to the competitor. · CC.5.1
Legal, with conditions 1 class
Need not be OEM but must meet all dimensions and regulations. · K.8.1
Legal, with conditions 1 class
Must be an exact replica of the original deck with no dimensional or scale changes. Minor angle and radii adjustments may be approved. Silhouette test settles appearance disputes (V.9.4). · V.9.1
Legal 2 classes
Aftermarket top decks may be used, and an aftermarket hull may be fitted to an OEM deck, with any bow appendage kept to original specifications and approved.
- Ski 1100 Modified · R.6.1
- Ski 1500 Modified · Q.6.1
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.
- Drag, 2 Stroke Unlimited · DD.12
- Drag, Stand Up Unlimited · DD.10
- Drag, Unlimited · DD.6
Aftermarket or modified top deck: 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.
Hull and handling · two and four stroke · legal in 6 of 29 answered, 4 with conditions