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Class Legality

IJSBA · Ignition

Aftermarket or lightened flywheel, IJSBA

IJSBA answers this part for 20 of its classes. 4 of those answers permit the part outright and 0 permit it with stated conditions, leaving 16 that do not. 13 are inferred from how the class is written rather than quoted from a rule naming this part.

This page is IJSBA only, and the bodies do not agree. The same part under IHRA. Which one applies to you is decided by whoever sanctions the race you enter.

Where it stands, class by class

20 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.
The rules do not say
Unanswered. The rules do not settle this, so ask the club before you rely on it.
Legal
Keep it. The rules permit this part in this class.

OEM part required 1 class

Flywheels must be OEM stock and unmodified as supplied from the factory. Sea-Doo HX must use the OEM unmodified 720 flywheel.

  • Sport Spec · section headings, no numbered rules

Not permitted, not listed in the rules 1 class

No flywheel change is listed: the four-stroke ignition section opens only replacement batteries, ECU reprogramming and spark plugs, and changes not listed are not permitted. · SSK.1.1, SSK.5

Not permitted, not listed in the rules 1 class

Only the flywheel cover is listed, and VSKL.5.3 lets it be modified to accept a crankshaft-end bearing support; VSKL.5.1 keeps the original equipment charging system and allows no other ignition modification. · VSKL.1.1, VSKL.5.1, VSKL.5.3

Not permitted, not listed in the rules 1 class

Not listed in this class document, so illegal under the closed-list rule (SKL.1.1); SKL.3.5 also bars internal modification of any kind, machining included, on any engine component.

Not permitted, not listed in the rules 1 class

Only the flywheel cover is listed, and VSC.5.3 lets it be modified to accept a crankshaft-end bearing support; VSC.5.1 keeps the original equipment charging system and allows no other ignition modification. · VSC.1.1, VSC.5.1, VSC.5.3

Not permitted, not listed in the rules 1 class

Only the flywheel cover is listed, and VX2.5.3 lets it be modified to accept a crankshaft-end bearing support; VX2.5.1 keeps the original equipment charging system and allows no other ignition modification. · VX2.1.1, VX2.5.1, VX2.5.3

Not permitted, not listed in the rules 1 class

VSK.5.1 lists the ignition changes it allows, the CDI unit, timing, the pickup mount and a total loss system, then allows no other, so the flywheel itself stays as supplied while VSK.5.3 lets its cover be modified or aftermarket. · VSK.1.1, VSK.5.1, VSK.5.3

Aftermarket or lightened flywheel: 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 · checks on parts the shop sells · how this site reads a rulebook.

Ignition · two and four stroke · legal in 4 of 20 answered

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