Personal watercraft engine

Personal watercraft engine (PWC) is a marine SI engine that does not meet the definition of outboard engine, inboard engine or sterndrive engine, except that the Administrator in his or her discretion may classify a PWC as an inboard or sterndrive engine if it is comparable in technology and emissions to an inboard or sterndrive engine.

Source

40 CFR § 91.3

---

Scoping language

The following definitions apply to this part 91. All terms not defined herein have the meaning given them in the Act.

---

Is this correct? or