OEM part required 4 classes
Must remain OEM.
- Runabout Endurance · W.7.4
- Runabout Lites · AA.5.1
- Runabout GP2 · Y.7.1
- Runabout GP3 · Z.10.1
IHRA · Hull and handling
Ventilation tubes and vent sealing, IHRA
IHRA answers this part for 29 of its classes. 0 of those answers permit the part outright and 13 permit it with stated conditions, leaving 16 that do not. 4 of the ones that do not are classes we read as open rather than as refusing it. 12 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.
- 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.
Not permitted, not listed in the rules 8 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
Legal, with conditions 7 classes
Ventilation tubes may be altered, aftermarket, repositioned on the original ducting or removed, but inlet and outlet openings keep stock size, and vents may be covered or sealed with no other hood change, cover or cowling.
- Four-Stroke Ski Lites · N.5.1
- Ski Lites · O.6.1
- Ski 1100 Modified · R.6.3
- Ski 1500 Modified · Q.6.3
- Runabout Limited · BB.10.2
- X2 Vintage · T.6.2
- Ski Vintage · S.6.2
Legal, with conditions 2 classes
Ventilation tubes in the engine compartment may be altered, replaced with aftermarket options, repositioned on the original ducting or removed, with no opening-size limit stated, though covering or sealing a vent is not named.
- Ski GP · K.8.3
- Runabout GP · X.7.4
Legal, with conditions 1 class
Opening sizes unchanged. No hood modifications, covers, or cowlings. · L.5.1
Legal, with conditions 1 class
Openings may not be enlarged. AFTERMARKET HOODS ARE NOT ALLOWED. · M.2.3
Legal, with conditions 1 class
On both engine types engine-compartment ventilation tubes may be altered, replaced with aftermarket tubes, repositioned on the original ducting or removed, but inlet and outlet openings keep their stock size, and vents may be covered or sealed with no further hood change. · N.5.1, O.6.1
Legal, with conditions 1 class
The storage covers and ventilation clause allows aftermarket covers and engine components that create no hazard and keep the OEM appearance, which on its heading reaches vent tubes and vent covers, though tubes are not named. · V.9.6
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
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
Ventilation tubes and vent sealing: 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 13 of 29 answered, all with conditions