Title 40
SECTION 91.104
91.104 Exhaust emission standards for outboard and personal watercraft engines.
§ 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
[grams per kilowatt-hour]
| Model year | P <4.3 kW HC + NOX emission standard by model year | P >4.3 kW HC + NOX emission standard by model year |
|---|---|---|
| 1998 | 278.00 | (0.917 × (151 + 557/P 0.9)) + 2.44 |
| 1999 | 253.00 | (0.833 × (151 + 557/P 0.9)) + 2.89 |
| 2000 | 228.00 | (0.750 × (151 + 557/P 0.9)) + 3.33 |
| 2001 | 204.00 | (0.667 × (151 + 557/P 0.9)) + 3.78 |
| 2002 | 179.00 | (0.583 × (151 + 557/P 0.9)) + 4.22 |
| 2003 | 155.00 | (0.500 × (151 + 557/P 0.9)) + 4.67 |
| 2004 | 130.00 | (0.417 × (151 + 557/P 0.9)) + 5.11 |
| 2005 | 105.00 | (0.333 × (151 + 557/P 0.9)) + 5.56 |
| 2006 and later | 81.00 | (0.250 × (151 + 557/P 0.9)) + 6.00 |
(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.