UIM · Engine

Aftermarket four-stroke crankshaft

UIM answers this part for 21 of its classes. 0 of those answers are permissions, with or without limits attached, and 21 are not. 5 are inferred from how the class is written rather than quoted from a rule naming this part. 6 are inherited from a parent class the rulebook points at.

---

This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter, and where both govern you, you are held to the stricter of the two. The differences are set out in the rulebook comparison.

Where it stands, class by class

21 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. 6 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.

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.

OEM part required 3 classes

502.01.03-02

• Runabout GP4 · 502.01
• Runabout Juniors GP4 · 302.01 · borrows another class
• Runabout Ladies GP4 · 302.01.01 · borrows another class

OEM part required 2 classes

Crankshaft must remain stock; replacement bearings or bearing shells only, of original type and dimensions. · 501.01.03.02

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

OEM part required 1 class

502.02.04-02

• Runabout GP3 · 502.02

OEM part required 1 class

502.03.04-02

• Runabout GP2 · 502.03

OEM part required 1 class

Four-stroke crankshaft stock.

• Ski Division GP2 · 501.03

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

No rule, this is an open class 3 classes

No article covering this part. Free under the open-list reading of · GP1.

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

No rule, this is an open class 2 classes

No engine article.

• Runabout GP1 · 502.04
• Runabout Veterans GP1 · 302.01.05 · borrows another class

---

Aftermarket four-stroke crankshaft: 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.