Not legal 3 classes
502.01.06-02
- Runabout GP4 · 502.01
- Runabout Juniors GP4 · 302.01 · borrows another class
- Runabout Ladies GP4 · 302.01.01 · borrows another class
UIM · Driveline
Aftermarket pump/impeller housing, stator vane assembly, pump plate, pump shoe
The clean line between a stock pump and a race pump.
Where it stands, class by class
24 classes, grouped by the answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules. 8 of them publish no component rules of their own and are marked below; for those, the link to the parent class is read from the categories table rather than stated in the rulebook.
Not permitted, not listed in the rules Our 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.
No rule, this is an open class Our reading, not a rule we can quote at you. This class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms.
Not legal 2 classes
ANY internal modification - grinding, surfacing, polishing, machining, shot blasting - of any transmission component, including the stator and exit cone, is prohibited. · 501.01.06.02
- Ski Division GP4
- Ski Juniors GP4 · borrows another class
Not permitted, not listed in the rules 3 classes
Nozzle, stator and pump housing are not listed as modifiable, so under the closed-list rule they must stay · OEM
- Ski Division GP3
- Ski Juniors GP3.2 · borrows another class
- Ski Juniors GP3.3 · borrows another class
Not permitted, not listed in the rules 1 class
Pump, stator, nozzle and driveshaft modification is not granted in · GP3.
Governed by the parent class 8 classes
No component rules are published for this class and no single parent class is named, so this part cannot be answered for it. That is an absence in the rulebook, not a permission.
- Endurance · 317.03
- Freestyle Amateur · 312
- Freestyle Free · 312
- Jet Raid · 317.01
- Offshore · 317.02
- Parallel Slalom · 313
- Ski Future Electric (SFE) · 302.01
- UIM Hydro-Fly · 900
Legal, within limits 1 class
TWO-STROKE only. Four-stroke retains the prohibition on any transmission modification. · 502.03.09, 502.03.10
Legal 1 class
Impeller housing, stator vane assembly, pump mounting plate and pump shoe may be modified or aftermarket. · 501.03.09.01
No rule, this is an open class 3 classes
No driveline article.
- Ski Division GP1 · 501.04
- Ski Ladies GP1 · 314 · borrows another class
- Ski Veterans GP1 · 302.01.05 · borrows another class
No rule, this is an open class 2 classes
No article covering this part. Free under the open-list reading of · GP1.
- Runabout GP1
- Runabout Veterans GP1 · borrows another class
Aftermarket pump/impeller housing, stator vane assembly, pump plate, pump shoe: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.
Every UIM class · where the rulebooks differ · signed checks on parts the shop sells.
Driveline · two and four stroke · legal outright in 2 of 24