premise: The rule regulates exhaust emissions from new spark-ignition (SI) gasoline marine engines including outboard engines, personal watercraft engines and jet boat engines beginning with the 1998 model year and the rule is fully phased-in by the 2006 model year.
hypothesis: The rule is in place to regulate exhaust emissions for new spark-ignition (SI) gasoline marine engines. The rule applies to models made in the year 1998 and onwards. The rule has been fully phased-in by the 2006 model year. 