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Class Legality

IHRA · drag

Drag, Sea-Doo Pro Stock

IHRA 2026, DD.2. A closed-list class. The craft must stay stock except where the rules allow otherwise, so anything unlisted is not permitted.

  • 3Not legal
  • 14OEM part required
  • 19Not permitted, not listed in the rules
  • 19Legal, with conditions
  • 14Legal

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
Must start as an OEM Sea-Doo personal watercraft. No model-year list is published.
Displacement limit
No displacement ceiling. Eligibility is by manufacturer.
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 (2)

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.

  • The same DD closed-list problem applies. A bullet list read as an exhaustive permission set leaves most of the craft unaddressed and therefore illegal.
  • This class permits aftermarket camshafts and fuel injectors where the equivalent Yamaha class at DD.1 requires both to be OEM. The two Pro Stock classes are not equivalent and a single Pro Stock answer would be wrong for one of them.

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 class criteria of any kind.
  • No cooling article.
  • No ignition timing article.

What the rules say (69 parts)

14 permitted outright, 19 permitted with stated conditions, 3 refused by a rule we can quote, 14 held to the original part by a rule we can quote and 19 refused by our reading of the class rather than by a quoted rule. Grouped where the same rule gives the same answer, so two "Not legal" groups can sit side by side under different rules.

What each answer below means

Not legal
This comes off. The rules refuse it in this class.
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.
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.

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

Not legal1 part

Nitrous oxide is not permitted, and neither is a turbocharger unless the craft came with one. DD.2

OEM part required1 part

Must remain OEM. Cable-driven bodies may be bored to latest-model specifications. DD.2

OEM part required1 part

DD.2 opens only aftermarket supercharger wheels and lists no aftermarket unit, so the supercharger the craft came with stays, keeping the OEM-style gear drive off the flywheel at the PTO. Water cooling of the unit is allowed. DD.2, DD

OEM part required1 part

Sea-Doo Pro Stock starts from an OEM craft and keeps its hull, so no replacement hull may be fitted. DD.2

OEM part required1 part

No holes are permitted, and any existing hole must be replaced with an OEM uncut panel. DD.2

OEM part required1 part

Modifications permitted, no open holes. Both OEM seats if originally equipped. DD.2

OEM part required1 part

Splitting and lightening are both banned and no other hull work is listed, so only a repair within 2 mm (0.08 in) of the original configuration is open. DD.2, J.13, DD

Not permitted, not listed in the rules19 parts

On a closed list an unlisted modification is not permitted. A.2.2, J.1

Legal, with conditions1 part

Fuel pressure regulators and upgraded fuel lines are permitted, alongside the single in-tank electric pump. DD.2

Legal, with conditions1 part

J.7, in the general rules for every class, names wiring as replaceable with aftermarket options, which overrides the closed-list default and covers replacement wiring. Connectors are not named on their own, and J.7 does not open added inputs or outputs, a different harness design or an ECU. J.7

Legal, with conditions1 part

Factory compression must be maintained. DD.2

Legal, with conditions1 part

Repairs are allowed for a crack or puncture, but only one damaged area affecting one cylinder bank. No other modification. J.11

Legal, with conditions1 part

Must meet OEM specifications. Oversized valves NOT allowed. DD.2

Legal, with conditions1 part

Aftermarket wheels permitted but the system must retain the OEM-style gear drive off the flywheel at the PTO. Water cooling permitted. DD.2

Legal, with conditions1 part

May be replaced within OEM specifications. J.18.3

Legal, with conditions1 part

Aftermarket or modified, full-length type with at least one bar parallel to the driveshaft, dropping no more than 12.00mm (0.47 in) below the flat plane of the pump intake. DD.2, J.18.1

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). DD.2, 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

Braking devices may be disabled for safety, and reverse buckets and trim motors may be removed or modified to disable them, provided no hazard is created. J.18.4

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. DD.2, J.16

Legal, with conditions1 part

The seat must be OEM with no open holes, and both OEM seats fitted where the craft had two, but modifications are permitted, read here as taking in a replacement cover. DD.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

Under the general maintenance allowance a cooling hose or clamp may be aftermarket, and DD.2 keeps the jet pump stock except for its water fittings; no other fitting is named. J.7, DD.2

Legal1 part

Aftermarket camshafts and cam gears are permitted, with no lift, duration or timing limit stated. DD.2

Legal1 part

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

Legal1 part

Aftermarket intercoolers are permitted, with no size, type or mounting limit stated. DD.2

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

IHRA 2026, DD.2, 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

“Drag, Sea-Doo Pro Stock, IHRA class rules”, BaddJet archive, https://baddjetarchive.com/legality/ihra/drag-seadoo-pro-stock/

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69 parts read · 14 permitted, 19 with conditions · 2026 rulebook

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