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Ski GP3

IHRA · ski

Ski GP3

IHRA2026, M. 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 (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.

  • M.2.4 permits boring "to the class cc limit, which may exceed the 1mm overbore as defined in the General Equipment Standards". There is no section called General Equipment Standards anywhere in this rulebook. The only explicit 1 mm overbore cap is in Sport Spec at U.2.1, which does not govern here.
  • Drop-down domes are prohibited on the Kawasaki heads at M.6.1.1 and the minimum dome volume is given as 28cc. Whether that minimum applies to the 750 and the 800 alike is not separated in the text.
  • The Yamaha SuperJet four-stroke may not use Wedge Sponsons (M.6.2.2). The rulebook names a product and defines nothing, so which sponsons that prohibition reaches is not answerable from this document.

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 reed valve article, in a class built around two-stroke machines. Under the closed-list principle an aftermarket reed cage is therefore not permitted, which is a reading of silence.
  • No sponson article beyond the general J.16 rule and one model-specific prohibition.

What the rules say (76 parts)

38 permitted outright, 35 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

Not legal1 part

Aftermarket hoods are not allowed in Ski GP3. M.2.3

OEM part required1 part

The original carburetor body must stay, with only the jets, needle valves and needle valve springs replaceable, the choke removable if it creates no extra air intake, and an aftermarket primer allowed. M.2.2

Not permitted, not listed in the rules35 parts

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

Legal, within limits1 part

Only the jets, needle valves and needle valve springs replaceable, the choke removable if it creates no extra air intake, and an aftermarket primer allowed, and nothing else on the carburetor may be changed. M.2.2

Legal, within limits1 part

On the Kawasaki 750SX, 750SXI, 750SXI Pro and SXR800 the trigger plate holes may be modified or a timing advance plate added, for advancing only. M.6.1.2

Legal, within limits1 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, 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

2-stroke cylinders interchangeable within the same manufacturer. May be bored to the class cc limit, which may exceed a 1 mm overbore. M.2.4 Yamaha SuperJet (2-stroke): 760 cylinder: allowed, aftermarket CDI box allowed, exhaust must remain stock. 701 cylinder: purpose-built wet pipe allowed (converting a dry pipe is NOT), CDI must remain OEM, timing may not be altered, head and base gasket OEM thickness, cylinders OEM bored max 1 mm over. M.6.2.1.2

Legal, within limits1 part

2-stroke: cooling holes may be modified or removed; not less than 0.05 mm of OEM. 4-stroke: OEM thickness and dimensions +/-10%. M.2.1

Legal, within limits1 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, within limits1 part

May be replaced within OEM specifications. J.18.3

Legal, within limits1 part

Kawasaki 750SX, Kawasaki SXR800: Nozzle may be bored. Pump stuffers may be added. M.6.1.3 Yamaha SuperJet (2-stroke): Nozzle may be modified for angle adjustment. M.6.2.1.3

Legal, within limits1 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, within limits1 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, 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

Yamaha SuperJet (2-stroke): Hull extensions allowed. No skegs, rudders, or fins. Must not exceed the planing surface width. Limits: max rear extension 100 mm. M.6.2.1.1

Legal, within limits1 part

The J.16 envelope applies here as it does everywhere else, and section M adds one model exception. Yamaha SuperJet four-strokes may not use Wedge Sponsons. J.16, M.6.2.2

Legal, within limits1 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, within limits1 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, within limits1 part

Constant mass, not liquid, in normally exposed hull areas. M.4.4

Legal, within limits1 part

2-stroke: max 2 cylinder-head cooling outlets, no larger than 1/8 inch NPT. No additional fittings. Head must remain stock OEM with no modifications. 4-stroke (M.3.2): waterlines and fittings aftermarket only at OEM size. M.3.1

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

IHRA 2026, M, 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.

76 parts read · 38 permitted outright · 2026 rulebook

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BaddJet Class Legality