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Class Legality

IHRA · drag

Drag, Yamaha Spec

IHRA 2026, DD.3. A closed-list class. The craft must stay stock except where the rules allow otherwise, so anything unlisted is not permitted.

  • 3Not legal
  • 11OEM part required
  • 19Not permitted, not listed in the rules
  • 21Legal, with conditions
  • 15Legal

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
OEM Yamaha personal watercraft. No model-year list is published.
Displacement limit
No displacement ceiling.
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.

  • The same DD closed-list problem applies.
  • Hull splitting is permitted here and prohibited in Yamaha Pro Stock, with no stated reason and no difference in the eligible craft. A hull answer has to name which of the two classes it is about.
  • This class says exterior bumpers are not required, where I.17 requires a permanently affixed nose bumper on every craft not originally built without one. Section DD never says it overrides section I.

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.

What the rules say (69 parts)

15 permitted outright, 21 permitted with stated conditions, 3 refused by a rule we can quote, 11 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.3

OEM part required1 part

DD.3 lists no complete aftermarket supercharger, only parts of the one the craft came with: the impeller may be aftermarket, and the front housing OEM or aftermarket to OEM specification with no modification. Gearing stays stock with no re-gearing and no older centre gears on Yamaha models, and aftermarket shafts and rebuild kits are allowed. DD.3, DD

OEM part required1 part

Yamaha Spec starts from an OEM craft and keeps its hull, so no replacement hull may be fitted. DD.3

OEM part required1 part

OEM seat base; modifications permitted; only one seat required. DD.3

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

Waterbox must be retained; aftermarket permitted with a through-hull exhaust pipe. STRAIGHT PIPES NOT PERMITTED. DD.3

Legal, with conditions1 part

Aftermarket mechanical or electric but must be inside the fuel tank. External pumps not allowed. DD.3

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

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.3

Legal, with conditions1 part

Impeller may be aftermarket. Front housing OEM or aftermarket meeting OEM spec. Gearing must remain stock, no re-gearing, no older center gears. DD.3

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

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. 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). 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.3, J.16

Legal, with conditions1 part

Only the seat base must be OEM, and modifications are permitted, so the cover may be replaced. Only one seat is required. DD.3

Legal, with conditions1 part

DD.3 waives exterior bumpers for this class, where I.17 still requires a permanently affixed nose bumper, and nothing in section DD says it displaces a section I safety rule, which leaves this unresolved rather than permitted. DD.3, 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; J.7 names no cooling fitting. J.7

Legal, with conditions1 part

Work is allowed forward of the intake grate, with a cut through the hull repaired inside and out. The hull may be split but not lightened, the centre wall may come out where fitted, and plastics may be drilled for more air. The hull must be sealed together by rivets, bolts, adhesive or an equivalent. DD.3

Legal1 part

An aftermarket ECU is permitted with no limit stated, which this site reads as covering a reflash, as DD.1 and DD.2 say in terms. DD.3

Legal1 part

Aftermarket pistons are permitted, and unlike the Pro Stock classes factory compression need not be kept. DD.3

Legal1 part

Aftermarket camshafts and cam gears are permitted, with no lift, duration or timing limit stated. DD.3

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.3

Legal1 part

Aftermarket nozzles are permitted together with aftermarket pump assemblies, with no length limit stated in the class. DD.3

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.3, 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, Yamaha Spec, IHRA class rules”, BaddJet archive, https://baddjetarchive.com/legality/ihra/drag-yamaha-spec/

Add the date you read it.

69 parts read · 15 permitted, 21 with conditions · 2026 rulebook

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