UIM · Cooling
UIM answers this part for 24 of its classes. 11 of those answers are permissions, with or without limits attached, and 13 are not. 5 are inferred from how the class is written rather than quoted from a rule naming this part. 8 are inherited from a parent class the rulebook points at.
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.
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.
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
Water-exit derivations modified or replaced, directed downward and/or rearward. No new water exit on head, cylinder or casing. · 502.01.03
Legal, within limits 3 classes
Allowed; bypass fittings directed downward and/or rearward. · 501.02.03.08
Legal, within limits 2 classes
Allowed. NO WATER EXIT may be added to the cylinder head, cylinder or casing. Bypass fittings must be directed downward and/or rearward. · 501.01.03
Legal, within limits 1 class
502.02.03-08, 502.02.04
Legal, within limits 1 class
502.03.03-08, 502.03.04
Legal, within limits 1 class
Allowed; four-stroke thermostats and pressure-regulating valves may be bypassed or removed. No fittings added to head, cylinder or casing on four-strokes.
No rule, this is an open class 3 classes
No cooling article beyond the turbo water-jacket rule.
No rule, this is an open class 2 classes
No article covering this part. Free under the open-list reading of · GP1.
Aftermarket cooling lines, bypass systems and fittings: 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.
Cooling · two and four stroke · legal outright in 11 of 24