UIM · Driveline

Aftermarket pump cover plate / extension, UIM

Legal in all 16 UIM classes that publish rules. The dimension differs by division and by class within Runabout.

This page is UIM only, and the bodies do not agree. The same part under IJSBA. Which one applies to you is decided by whoever sanctions the race you enter.

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This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter. If you race more than one series, build to the stricter answer. The differences are set out in the rulebook comparison.

Four different answers for one part type. Runabout GP1 is not just a smaller number than Runabout GP3 - it is measured from a different datum.

Where it stands, class by class

24 classes, grouped where the same rule gives the same 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 borrow another class’s rules and are marked below; for those, the link to the parent class is read from the categories table rather than stated in the rulebook. 8 publish no rule for this part and name no parent to borrow one from, and are grouped together at the end.

What each answer below means

Legal, with conditions

Keep it, but measure it: the rules permit this part only inside stated limits.

No rule published for this class

Unanswerable here. This class publishes no rule for the part and names no parent class to borrow one from, which is an absence in the rulebook and not a permission.

Legal, with conditions 3 classes

Max 177.80 mm. · 502.01.02-20

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

Legal, with conditions 3 classes

Max 100 mm. · 501.02.02.16

• Ski Division GP3
• Ski Juniors GP3.2 · borrows another class
• Ski Juniors GP3.3 · borrows another class

Legal, with conditions 3 classes

Max 100 mm beyond THE END OF THE PUMP ITSELF. · 501.04.02.04

• Ski Division GP1
• Ski Ladies GP1 · borrows another class
• Ski Veterans GP1 · borrows another class

Legal, with conditions 2 classes

Max 100 mm beyond the end of the OEM plate; extension no wider than OEM; sides connected to the radiused portion; no fins, rudders or skegs.

• Ski Division GP4 · 501.01
• Ski Juniors GP4 · 302.01 · borrows another class

Legal, with conditions 2 classes

Max 100 mm beyond THE END OF THE PUMP ITSELF - a different measurement from the lower classes' 177.80 mm plate dimension. · 502.04.02-04

• Runabout GP1
• Runabout Veterans GP1 · borrows another class

Legal, with conditions 1 class

Max 177.80 mm (7.00 in). · 502.02.02-17

• Runabout GP3

Legal, with conditions 1 class

Max 177.80 mm via GP3 inheritance.

• Runabout GP2 · 502.03

Legal, with conditions 1 class

Max 100 mm via GP3 inheritance.

• Ski Division GP2 · 501.03

No rule published for this 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

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Aftermarket pump cover plate / extension: 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 · checks on parts the shop sells · how this site reads a rulebook.