UIM · Driveline
Distinct from hull trim tabs and judged under the driveline rules.
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.
Not permitted, not listed in the rules Our reading, not a rule we can quote at you. This class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list.
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.
Not permitted, not listed in the rules 5 classes
Not listed in this class. Illegal under the class's own stock clause.
The rules do not say 1 class
The GP4 manual-trim substitution is not repeated and the aftermarket nozzle-trim permission appears only at · GP2.
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
The original trim system may be replaced by a MANUAL system, without nozzle modifications. · 502.01.06-04
Legal 1 class
502.03.09-01
Legal 1 class
Aftermarket nozzle-trim systems. · 501.03.09.01
No rule, this is an open class 5 classes
No article covering this part. Free under the open-list reading of · GP1.
Aftermarket nozzle trim system (pump-mounted): 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 5 of 24