IHRA · Fuel
IHRA answers this part for 14 of its classes. 11 of those answers are permissions, with or without limits attached, and 3 are not. 3 are inferred from how the class is written rather than quoted from a rule naming this part.
14 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.
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.
Legal, within limits 3 classes
Only the jets, needle valves and springs replaceable, the choke removable and an aftermarket primer allowed, and nothing else on the carburetor may be changed.
Legal, within limits 2 classes
On two-stroke entries the venturi count may not exceed the cylinder count, and slide-type is prohibited.
Legal, within limits 1 class
Model-dependent. Polaris Hurricane, Yamaha WaveBlaster 701: Aftermarket permitted. U.3.1 Sea-Doo HX: Stock carburetors; jetting and de-choking allowed. · U.3.1
Legal, within limits 1 class
Only the jets, needle valves and needle valve springs replaceable, the choke removable if it creates no extra air intake, and an aftermarket primer allowed, and nothing else on the carburetor may be changed. · M.2.2
Legal, within limits 1 class
No slide-type carburetors, and no more venturis than the engine has cylinders. · T.3.1
Legal, within limits 1 class
Slide-type carburetors NOT allowed. · S.3.1
Legal, within limits 1 class
No more venturis than the engine has cylinders, and carburetors may be run with or instead of injection. · CC.3.1
Legal, within limits 1 class
Venturi count must not exceed cylinder count and slide-type is prohibited, and four-stroke entries may run carburetors alongside or in place of EFI. · V.3.1
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.
Carburetor jets, needle valves and springs: 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.
Fuel · two stroke · legal outright in 11 of 14