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Class Legality

IHRA · freestyle

Freestyle

IHRA 2026, CC. An open class. It carries no clause requiring the craft to stay stock, so anything the rules do not restrict appears to be permitted. That reading is ours rather than the rulebook’s.

  • 1Not legal
  • 28Legal, with conditions
  • 6Legal
  • 43No rule, this is an open class

Read out of the published IHRA rulebook on 2026-09-11, so confirm anything that decides a purchase. The full note is at the foot of the page.

Running the class

Eligible craft
Not restricted by model. The craft is constrained by displacement and by the top deck description at CC.5.1.
Displacement limit
1500cc naturally aspirated four-stroke, 950cc forced-induction four-stroke, 900cc two-stroke in Amateur and 1200cc two-stroke in Pro (CC.1). Amateur and Pro follow the same modification rules and differ only in the two-stroke ceiling. The four-stroke ceilings are the same for both. CC.1 states the limits by category. Nothing in the held engine section allows the engine to be bored past them.
Licence or tier
Not stated.
Minimum weight
Not stated.

Read from the same class section as the part answers. The rider side of the sport, tiers, ages, licences and what gets inspected, is set out across the bodies at Racing.

Open questions on this class (3)

Places where the rulebook contradicts itself, or where a figure could not be settled. Nothing in this list is decided, and it sits here rather than in a footnote because it is what you would want before spending money.

  • CC.2.1 and CC.3.4 both use the word homologated, and the rulebook publishes no list of homologated watercraft. A crankcase replica has to resemble a homologated two-stroke crankcase and the set it must resemble is not enumerated anywhere.
  • CC.4.3 permits an intake grate that is either full-length with a bar parallel to the driveshaft or horizontally mounted blocking at least 40 per cent of the intake area. The second option appears in no other class.
  • In an open class the absence of an article is the reason a part is free rather than the reason it is prohibited, so the three absences listed above have the opposite effect here from everywhere else in this rulebook.

Sections this rulebook does not contain for this class

Confirmed absent by a targeted read rather than merely unnoticed. In a closed-list class an absent article is why a part reads as not permitted; in an open class it is why one reads as open.

  • No sound limit.
  • No hull length or width.
  • No minimum weight.

What the rules say (78 parts)

6 permitted outright, 28 permitted with stated conditions, 1 refused by a rule we can quote and 43 left open by our reading of the class rather than by a quoted permission. Grouped where the same rule gives the same answer, so two "Not legal" groups can sit side by side under different rules. An open class gives one answer to most questions, and printing it once per part would say the same sentence forty times.

What each answer below means

Not legal
This comes off. The rules refuse it in this class.
Legal, with conditions
Keep it, but measure it: the rules permit this part only inside stated limits.
Legal
Keep it. The rules permit this part in this class.
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.

Read the refusals as a list of work. Anything below marked Not legal, OEM part required, or Not permitted has to come off the machine, or go back to the standard part, before it races in this class.

Not legal1 part

Bolts, nuts and washers may not be substituted with titanium unless originally equipped. Locking mechanisms are allowed. J.7

Legal, with conditions1 part

The class requires a flame arrester meeting USCG, UL-1111 or SAE J-1928 rather than the OEM one, so a compliant aftermarket arrester reads as allowed. CC.3.5

Legal, with conditions1 part

Butterfly count may be increased but must not exceed cylinder count. CC.3.6

Legal, with conditions1 part

Automatic shut-off control switch required, and manual on/off pumps are prohibited. Limits: max 4 psi. CC.3.3

Legal, with conditions1 part

NOT restricted to a homologated watercraft. Must meet or exceed original strength and safety standards. Securely fastened. Filler may be relocated, including internally. CC.3.4

Legal, with conditions1 part

SAE J30R9 high-pressure hose. Metal filters on high-pressure lines. Threaded fittings or crimped clamps only. NYLON TIE WRAPS AND STANDARD SCREW CLAMPS NOT ALLOWED on high-pressure lines. CC.3.2

Legal, with conditions1 part

Gauges may be modified or removed provided no hazard is created and any resulting hole is sealed. Section J permits modification and removal and never addresses adding an aftermarket instrument. J.15

Legal, with conditions1 part

OEM crankcases may be substituted with eligible replicas of homologated two-stroke crankcases that reasonably resemble the OEM part and allow some OEM components to still be used. CC.2.1

Legal, with conditions1 part

May be modified or replaced with an aftermarket part. The original diameter must be maintained in Stock class, and the rulebook never defines which classes that is. J.18.2

Legal, with conditions1 part

May be replaced within OEM specifications. J.18.3

Legal, with conditions1 part

Required. Full-length with a bar parallel to the driveshaft, or horizontally mounted blocking at least 40% of the intake area. Leading edges radiused. Limits: max below pump intake plane 12 mm, alt min blocked area 40 per cent. CC.4.3

Legal, with conditions1 part

Aftermarket or modified. An extension may not exceed the width of the original plate, and on a ski may not extend more than 100 mm (3.94 in). J.18.1

Legal, with conditions1 part

Replacement trim plates may be used provided they mimic the handling characteristics of the stock plates. J.18.2

Legal, with conditions1 part

Fixed or movable, with actuation hardware. Must not exceed the width of the planing surface. Limits: max rear extension 100 mm. CC.4.2

Legal, with conditions1 part

CC.1 leaves an aftermarket hull open, but CC.5.1 requires it to be no smaller than the top deck's minimum measurements and joined to the deck by the original method. It may create no safety hazard and may not be tethered or fastened to the rider. CC.1, CC.5.1

Legal, with conditions1 part

Must resemble an OEM homologated top deck: handle pole attachment forward of the hood, ride tray aft of it, raised gunnels each side of the tray. Hull may be no smaller than the minimum measurements of the top deck. Deck and hull joined by the original method. No part of the hull, deck, or handle pole may be tethered or fastened to the competitor. CC.5.1

Legal, with conditions1 part

Aftermarket, modified, repositioned or removed. Up to two, each no longer than 36 in (91.45 cm), protruding no more than 3.94 in (100 mm) horizontally, at least 6 mm thick with radiused leading edges, and not attached to a planing surface. J.16

Legal, with conditions1 part

Footholds may be installed in the footwells; foot straps on the tray. If the craft is also raced, footwells must be blocked off. CC.5.2

Legal, with conditions1 part

The handle pole assembly and mounting brackets may be modified or replaced provided original functionality is retained. Length may be altered and the attaching point reinforced. J.17.2

Legal, with conditions1 part

Replacement bumpers and side rails may be used provided they create no hazard. A permanently affixed nose bumper remains required. J.13, I.17

Legal, with conditions1 part

May be added to adjust handling. Constant mass only, and no other part may be modified to carry it. J.19

Legal, with conditions1 part

CC.1 opens any change section CC does not restrict, and CC.5.1 sets two limits on the hull: it may be no smaller than the top deck's minimum measurements, and it must be joined to the deck by the original method. CC.1, CC.5.1

Legal1 part

May be replaced, as may starters and oil injection systems, with the oil injection system removable or disconnectable. J.8

Legal1 part

Grips, throttle and cables may be modified or aftermarket. The bar must be padded at the mounting bracket or the crossbar padded. J.17.1

Legal1 part

Steering shaft, holder, handlebar holder and cables may be aftermarket, and quick-turn modifications are allowed. J.17.2

Legal1 part

The bilge pump may be modified or disconnected and aftermarket bilge draining systems are permitted, provided they create no hazard. J.10

No rule, this is an open class42 parts

No restriction in section CC, and CC.1 permits any modification it does not restrict.

No rule, this is an open class1 part

CC.1 opens an extension because section CC names none, and of the CC.5.1 hull limits the one that reaches it is that a fabricated part may create no safety hazard. CC.1, CC.5.1

IHRA 2026, CC, read from the rulebook on 2026-09-11. Read the rule yourself. Every IHRA class · where the rulebooks differ · how this site reads a rulebook.

This is one class. Every part below also has a page of its own showing where it stands across every class this body runs, and legality by part is the index of them.

Cite this page

“Freestyle, IHRA class rules”, BaddJet archive, https://baddjetarchive.com/legality/ihra/freestyle/

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78 parts read · 6 permitted, 28 with conditions · 2026 rulebook

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