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Ski Juniors GP3.2

UIM · ski

Ski Juniors GP3.2

UIM2026, 302.01. The rulebook does not state a governing principle for this class.

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 rulebook nowhere states in words that GP3.2 uses the 501.02 technical rules. It is an inference from the 800 cc match plus 315.01 saying the general UIM Aquabike rules apply. There is no rule number that makes the link explicit.
  • The 10-12 band sits below the 315.01 general junior floor of 7; the two are consistent but unreconciled.

What the rules say (58 parts)

30 permitted outright, 15 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

Only replaceable-type jets, needle valves and needle valve springs, choke removal and an aftermarket primer. NO OTHER CARBURETTOR MODIFICATIONS. 501.02.04.01

OEM part required1 part

OEM fuel tank, pickup, filler, filter, tap assembly and relief valve must be used and may not be modified. 501.02.04.02

Not permitted, not listed in the rules9 parts

Not listed in this class. Illegal under the class's own stock clause.

Not permitted, not listed in the rules1 part

No reed valve article exists for Ski GP3. Under the closed-list rule aftermarket reeds appear illegal here while explicitly legal in GP2, but the rulebook never says so directly.

Not permitted, not listed in the rules1 part

No hood article; ventilation tubes are covered separately.

Legal, within limits1 part

Must fit the OEM battery box and be securely fastened. GP2 additionally allows relocation of the battery, box or housing limited to the strict minimum needed to fit an aftermarket exhaust.

Legal, within limits1 part

Cylinders may be interchanged between homologated watercraft of the SAME MANUFACTURER. Engines may be bored. No internal modification of any kind. 501.02.03

Legal, within limits1 part

Must retain original port timing, compression ratio, dome profile, skirt length/shape and material type, and weigh within +/-25.00% of OEM. 501.02.03.04

Legal, within limits1 part

Rebuild allowed. Stroke and rod length may NOT change. Bearings must keep original type and dimensions. Counterweights must resemble the original with no new holes or pockets. Total assembly weight within +/-5.00% of OEM. Non-ferrous counterweights, crank pins and connecting rods are prohibited. 501.02.03

Legal, within limits1 part

Replacement gaskets of the same type as OEM, with the base gasket no thicker than 0.8 mm. 501.02.03.06

Legal, within limits1 part

Chamfering of NON-ORIGINAL cylinder ports up to 1.00 mm at a maximum 30 degree angle. 501.02.03.04

Legal, within limits1 part

Original diameter maintained. 501.02.06.01

Legal, within limits1 part

Permitted subject to the universal limits in uim-globals.yaml constants.

Legal, within limits1 part

Full-length type with at least one bar parallel to the drive shaft, all leading edges radiused, extending no more than 12.00 mm below the flat plane of the pump intake area. GP1 adds that the projecting member must be filed so as not to create a hazard.

Legal, within limits1 part

Same, plus the pole must be mounted in front of the engine compartment with MINIMUM 75 DEGREES of movement. 501.02.01.07, 501.02.02.10

Legal, within limits1 part

Replacement bumpers allowed. A soft flexible water-spray deflector may attach to the hull sides or bond flange, not exceeding the perimeter of the original bumpers or the external hull edge measured with a plumb line. SAFETY BUMPERS ARE COMPULSORY in both GP1 classes.

Legal, within limits1 part

All cooling system valves must be of FIXED OR AUTOMATIC type - thermostats, pressure regulators, solenoids. Manually controlled devices that alter cooling water flow while under way are prohibited in every class, as are electronic water injection systems unless of origin.

Legal1 part

CDI unit may be modified or aftermarket; RPM limiter bypassed or eliminated; ignition timing may be changed. OEM charging system required. 501.02.05

Legal1 part

Padding and mat kits may be added and custom painting is allowed. Metal components above the bond flange may be polished, shot peened or painted.

UIM 2026, 302.01, read from the rulebook on 2026-09-08, not verified by a racer. Read the rule yourself. Every UIM 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.

58 parts read · 30 permitted outright · 2026 rulebook

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