OEM part required 1 class
Must remain OEM. Modifications allowed. · DD.11
IHRA · Hull and handling
Aftermarket seat
IHRA answers this part for 18 of its classes. 4 of those answers are permissions, with or without limits attached, and 14 are not. 9 are inferred from how the class is written rather than quoted from a rule naming this part.
Where it stands, class by class
18 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.
Not permitted, not listed in the rules Our reading, not a rule we can quote at you. This class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list.
No rule, this is an open class Our reading, not a rule we can quote at you. This class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms.
OEM part required 1 class
Modifications permitted but no open holes. If originally two seats, both must be installed. · DD.1
OEM part required 1 class
Modifications permitted, no open holes. Both OEM seats if originally equipped. · DD.2
OEM part required 1 class
OEM seat base; modifications permitted; only one seat required. · DD.3
OEM part required 1 class
Must remain OEM. Modifications permitted. · DD.4
Not permitted, not listed in the rules 7 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
Legal, within limits 1 class
Model-dependent. Base and internal structure OEM. No airflow through the seat or base. Seat must stay attached throughout the race. Limits: max height increase 50 mm. W.7.5 Sea-Doo RXP-X (2021): Must remain a two-piece configuration on original mounting locations. Limits: max height change 12.7 mm. W.7.5.4 Sea-Doo RXT-X (2017): The removable rear seat must be installed and in position while racing. · W.7.5.4
Legal 3 classes
Aftermarket permitted.
- Runabout Limited · BB.10.1
- Drag, Super Stock · DD.5
- Runabout GP · X.7.2
No rule, this is an open class 2 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, Unlimited · DD.6
Aftermarket seat: 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.
Hull and handling · two and four stroke · legal outright in 4 of 18