UIM · Fuel

Aftermarket flame arrester / air filter, UIM

One of the broadest legal categories, but the standard matters.

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

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This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter. If you race more than one series, build to the stricter answer. The differences are set out in the rulebook comparison.

Publish the marine certification on the listing. IJSBA and UIM name the same three standards, so one certified part satisfies both.

Where it stands, class by class

24 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. 8 of them borrow another class’s rules and are marked below; for those, the link to the parent class is read from the categories table rather than stated in the rulebook. 8 publish no rule for this part and name no parent to borrow one from, and are grouped together at the end.

What each answer below means

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.

No rule published for this class

Unanswerable here. This class publishes no rule for the part and names no parent class to borrow one from, which is an absence in the rulebook and not a permission.

Legal, with conditions 3 classes

Equivalent aftermarket air filters/flame arresters available on the market; the flame arrestor/air restrictor DOWNSTREAM of the throttle body may be removed. · 502.01.04

• Runabout GP4
• Runabout Juniors GP4 · borrows another class
• Runabout Ladies GP4 · borrows another class

Legal, with conditions 3 classes

Aftermarket flame arresters meeting USCG, UL-1111 or SAE J-1928 Marine standards. · 501.02.04.01

• Ski Division GP3
• Ski Juniors GP3.2 · borrows another class
• Ski Juniors GP3.3 · borrows another class

Legal, with conditions 2 classes

Equivalent aftermarket air filters available on the market. · 501.01.04.01

• Ski Division GP4
• Ski Juniors GP4 · borrows another class

Legal, with conditions 2 classes

Two-stroke: flame arresters meeting the USCG, SAE J-1928 Marine or UL-1111 Marine backfire standard must be fitted, aftermarket ones included, and the intake silencer may be removed. Four-stroke: equivalent aftermarket air filters or flame arresters available on the market.

• Runabout GP2 · 502.03.05-05, 502.03.06-01
• Ski Division GP2 · 501.03.05.05, 501.03.06.01

Legal, with conditions 1 class

USCG, UL-1111 or SAE J-1928 Marine. · 502.02.05-01, 502.02.06-01

• Runabout GP3

No rule, this is an open class 3 classes

No induction article.

• Ski Division GP1 · 501.04
• Ski Ladies GP1 · 314 · borrows another class
• Ski Veterans GP1 · 302.01.05 · borrows another class

No rule, this is an open class 2 classes

No article covering this part. Free under the open-list reading of GP1.

• Runabout GP1 · 502.04
• Runabout Veterans GP1 · 302.01.05 · borrows another class

No rule published for this class 8 classes

No component rules are published for this class and no single parent class is named, so this part cannot be answered for it. That is an absence in the rulebook, not a permission.

• Endurance · 317.03
• Freestyle Amateur · 312
• Freestyle Free · 312
• Jet Raid · 317.01
• Offshore · 317.02
• Parallel Slalom · 313
• Ski Future Electric (SFE) · 302.01
• UIM Hydro-Fly · 900

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Aftermarket flame arrester / air filter: 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 UIM class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.