UIM · Driveline
Legal in every class. The dimension differs by division AND by class within Runabout.
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.
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.
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.
Legal, within limits 3 classes
Max 177.80 mm. · 502.01.02-20
Legal, within limits 3 classes
Max 100 mm. · 501.02.02.16
Legal, within limits 3 classes
Max 100 mm beyond THE END OF THE PUMP ITSELF. · 501.04.02.04
Legal, within limits 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.
Legal, within limits 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
Legal, within limits 1 class
Max 177.80 mm (7.00 in). · 502.02.02-17
Legal, within limits 1 class
Max 177.80 mm via GP3 inheritance.
Legal, within limits 1 class
Max 100 mm via GP3 inheritance.
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 · signed checks on parts the shop sells.
Driveline · two and four stroke · legal outright in 16 of 24