Aftermarket seat assembly or seat base

Runabout only. UIM's seat ladder is the clearest GP4-to-GP1 progression in the book.

Where it stands, class by class

15 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. 3 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.

OEM part required 3 classes

THE WHOLE ORIGINAL EQUIPMENT SEAT for that model and type must be used. · 502.01.02-12

Runabout GP4
Runabout Juniors GP4 · borrows another class
Runabout Ladies GP4 · borrows another class

OEM part required 1 class

The ORIGINAL EQUIPMENT BASE for that model and type must be used - a relaxation from GP4, which requires the whole seat. · 502.02.02-11

Runabout GP3

OEM part required 1 class

Original base only, via GP3 inheritance.

Runabout GP2 · 502.03

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 2 classes

Aftermarket, modified or PROTOTYPE seats permitted. Must respect the structure and measurements of those available on the market for pleasure-navigation homologated PWC. The base must be well consolidated as it is the divider between the engine compartment and the seat. Seat height may be modified up to 10% from the original model. Back rest height max 18 cm with rider seated. · 502.04.03

Runabout GP1
Runabout Veterans GP1 · borrows another class

Aftermarket seat assembly or seat base: 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.

Hull and handling · two and four stroke · legal outright in 2 of 15