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Drag, Yamaha Pro Stock

IHRA · drag

Drag, Yamaha Pro Stock

IHRA2026, DD.1. A closed-list class. The craft must stay stock except where the rules allow otherwise, so anything unlisted is not permitted.

Open questions on this class (4)

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.

  • Section DD states that anything not listed is not legal, and this class is a bullet list. Applied literally that makes every unmentioned component illegal, including ones the general technical regulations at section J expressly permit on all classes. Which of the two governs is not stated.
  • The supercharger bullet contradicts itself. It permits front and rear housings to be OEM or aftermarket, requires an aftermarket housing to meet OEM specification with no modification, and then requires gearing AND housings to remain OEM and unmodified. Both halves are printed and neither is withdrawn. DD.3 carries the equivalent bullet with only the gearing restricted and no contradiction.
  • 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, so a safety requirement and a drag allowance sit against each other unresolved.
  • The rulebook names Hydrodrags staff and Hydrodrags Garmin units inside DD without saying what relationship Hydrodrags has to IHRA.

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 hull dimensions, no displacement ceiling, no sound limit.
  • No cooling article.
  • No ignition timing article.

What the rules say (65 parts)

32 permitted outright, 17 answered by our reading of the class rather than by a quoted rule, 0 the rules do not settle. Grouped by the answer, because an open class gives one answer to most questions and printing it once per part would say the same sentence forty times.

Not permitted, not listed in the rulesOur reading, not a rule we can quote at you. This class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list.

Not legal1 part

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

OEM part required1 part

Must remain OEM and interchangeable between WaveRunner models, with vacuum fittings, upgraded throttle body spacers and ribbon deletes permitted. DD.1

OEM part required1 part

No modifications. Existing holes must be replaced with OEM uncut panels. Center wall may be removed. Exterior bumpers not required. DD.1

OEM part required1 part

Modifications permitted but no open holes. If originally two seats, both must be installed. DD.1

Not permitted, not listed in the rules17 parts

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

Legal, within limits1 part

Waterbox must be retained; aftermarket permitted with a through-hull exhaust pipe. STRAIGHT PIPES NOT PERMITTED. DD.1

Legal, within limits1 part

One aftermarket electric IN-TANK pump only. External or mechanical pumps not allowed. DD.1

Legal, within limits1 part

Fuel pressure regulators and upgraded fuel lines are permitted, alongside the single in-tank electric pump. DD.1

Legal, within limits1 part

Factory compression must be maintained. DD.1

Legal, within limits1 part

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

Legal, within limits1 part

Must meet OEM specifications. Oversized valves NOT allowed. DD.1

Legal, within limits1 part

The impeller must be OEM and unmodified, aftermarket shafts and rebuild kits are permitted, there is no re-gearing, and Yamaha models may not use older centre gears to alter OEM ratios. The housing rule contradicts itself in the same bullet, permitting front and rear housings to be OEM or aftermarket and then requiring gearing and housings to remain OEM and unmodified. Both are printed and neither is withdrawn. DD.1

Legal, within limits1 part

Impeller must be OEM and unmodified. Housings OEM or aftermarket meeting OEM spec with no modifications. Gearing and housings OEM and unmodified. No re-gearing. Yamaha may not use older center gears to alter OEM ratios. Aftermarket shafts and rebuild kits permitted. DD.1

Legal, within limits1 part

May be replaced within OEM specifications. J.18.3

Legal, within limits1 part

FX intake grates must use the OEM mounting bolt location and bolt pattern. DD.1

Legal, within limits1 part

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

Legal, within limits1 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, within limits1 part

No hull splitting or lightening. FZR/FZS/GP/VXR/FX: modifications only forward of the intake grate. FZR/FZS cut-through repairs EXTERNAL ONLY, no fiberglass inside the hull. GP/VXR and FX may repair internally and externally. Hull must be sealed to top deck by rivets, bolts, adhesive or equivalent. DD.1

Legal, within limits1 part

DD.1 says exterior bumpers are not required, while I.17 requires a permanently affixed nose bumper on every craft not originally built without one, and section DD never claims to override section I, so ask the series before removing anything. DD.1, I.17

Legal, within limits1 part

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

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

IHRA 2026, DD.1, read from the rulebook on 2026-09-11, not verified by a racer. Read the rule yourself. Every IHRA class · where the rulebooks differ.

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.

65 parts read · 32 permitted outright · 2026 rulebook

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