CFR

91.104—Exhaust emission standards for outboard and personal watercraft engines.

(a) New marine spark-ignition outboard and personal watercraft engines for use in the U.S. must meet the following exhaust emission standards for HC NOX. The exhaust emission standard for each model year is provided below. It is also used as input to the calculation procedure in § 91.207 to determine compliance with the corporate average HC NOX exhaust emission standard.

Hydrocarbon Plus Oxides of Nitrogen Exhaust Emission Standards

Model year	P < 4.3 kW HC NOX emission standard by model year	P > 4.3 kW HC NOX emission standard by model year
[grams per kilowatt-hour]
1998	278.00	(0.917 × (151 557/P0.9)) 2.44
1999	253.00	(0.833 × (151 557/P0.9)) 2.89
2000	228.00	(0.750 × (151 557/P0.9)) 3.33
2001	204.00	(0.667 × (151 557/P0.9)) 3.78
2002	179.00	(0.583 × (151 557/P0.9)) 4.22
2003	155.00	(0.500 × (151 557/P0.9)) 4.67
2004	130.00	(0.417 × (151 557/P0.9)) 5.11
2005	105.00	(0.333 × (151 557/P0.9)) 5.56
2006 and later	81.00	(0.250 × (151 557/P0.9)) 6.00

where:

P = the average power of an engine family in kW (sales weighted). The power of each configuration is the rated output in kilowatts as determined by SAE J1228. This procedure has been incorporated by reference. See § 91.6.

(b) Exhaust emissions are measured using the procedures set forth in subpart E of this part.

(c) Manufacturers must designate a Family Emission Limit (FEL) for HC NOX for every engine family. The FEL may be equal to the emission standard in paragraph (a) of this section. The FEL established through certification serves as the emission standard for the engine family and emissions may not exceed the FEL levels for HC NOX for all engines sold in the engine family, for their useful life.

(d) A manufacturer must comply with a corporate average HC NOX emission standard as determined in accordance with subpart C § 91.207.

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