UIM · Cooling
UIM answers this part for 16 of its classes, and publishes no rule for it in 8 more. 0 of those answers permit the part outright and 11 permit it with stated conditions, leaving 5 that do not. 5 of the ones that do not are classes we read as open rather than as refusing it. 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 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.
Legal, with conditions 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, with conditions 3 classes
Allowed; bypass fittings directed downward and/or rearward. · 501.02.03.08
Legal, with conditions 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, with conditions 2 classes
Allowed; four-stroke thermostats and pressure-regulating valves may be bypassed or removed. No fittings added to head, cylinder or casing on four-strokes.
Legal, with conditions 1 class
Two-stroke: the cooling system, cooling lines and bypass systems may be modified or aftermarket, with bypass fittings pointing downward and/or rearward. Four-stroke: water-exit derivations may be modified or replaced in the same directions, but no water exit may be added to the head, cylinder or casing. · 502.02.03-08, 502.02.04-04
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.
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.
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 · checks on parts the shop sells · how this site reads a rulebook.
Cooling · two and four stroke · legal in 11 of 16 answered, all with conditions