Not legal 1 class
Jets, needle valves and springs and choke removal only. · RAS.6
IJSBA · Fuel
Aftermarket or modified carburetor
Universal constraints: no slide-type carburetors anywhere, venturi count may not exceed cylinder count.
Sport Spec is per-model: the same carb SKU is legal on a Waveblaster and illegal on an HX.
Where it stands, class by class
13 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 legal 1 class
Only replaceable jets, needle valve and needle valve spring changes, choke removal and an aftermarket primer. · SKL.4.1
Governed by the parent class 1 class
Resolve via RAL.1.1 inheritance.
- Runabout Limited · RAL
Legal, within limits 1 class
ONLY ONE SINGLE CARBURETOR IS PERMITTED. · VSKL.4.1
Legal, within limits 1 class
Two-stroke aftermarket carburetors allowed. Four-stroke: jets and needles only.
Legal, within limits 1 class
Polaris Hurricane and Yamaha Waveblaster carburetors may be modified or aftermarket. SEA-DOO HX MUST RETAIN STOCK CARBURETORS (rejetting and de-choking only).
- Sport Spec · none - this document uses ALL-CAPS section headings, not numbered rules
Legal 1 class
VSC.4.1
- Vintage SC · VSC
Legal 1 class
VX2.4.1
- Vintage X2 · VX2
Legal 1 class
VSK.4.1
- Vintage Ski · VSK
Legal 1 class
FREST.4.1
- Freestyle · FREST
Legal 1 class
Venturi count up to the number of cylinders. · SKGP.4.1
Legal 1 class
SPGP.7.1
- Sport GP · SPGP
Legal 1 class
Carburetors may be used in addition to or instead of fuel injection, venturi count not exceeding cylinder count.
- Runabout Open / GP · ROP
Aftermarket or modified carburetor: 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 IJSBA class · where the rulebooks differ · signed checks on parts the shop sells.
Fuel · two stroke · legal outright in 10 of 13