['Air Programs']
['Air Emissions']
03/15/2023
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(a) The following standards, which EPA originally adopted under 40 CFR part 91, apply to outboard and personal watercraft engines produced from model year 2006 through 2009:
(1) For engines at or below 4.3 kW, the HC NOX standard is 81.00 g/kW-hr.
(2) For engines above 4.3 kW, the following HC NOX standard applies:
HC NOX standard = (151 557/P0.9) ⋅ 0.250 6.00
Where:
STD = The HC NOX emission standard, in g/kW-hr.
P = The average power of an engine family, in kW.
(b) Table 1 of this appendix describes the phase-in standards for outboard and personal watercraft engines for model years 1998 through 2005. For engines with maximum engine power above 4.3 kW, the standard is expressed by the following formula, in g/kW-hr, with constants for each year identified in Table 1 of this appendix:
| Model year | Maximum engine power <4.3 kW | Maximum engine power >4.3 kW | |
| A | B | ||
| 1998 | 278.00 | 0.917 | 2.44 |
| 1999 | 253.00 | 0.833 | 2.89 |
| 2000 | 228.00 | 0.750 | 3.33 |
| 2001 | 204.00 | 0.667 | 3.78 |
| 2002 | 179.00 | 0.583 | 4.22 |
| 2003 | 155.00 | 0.500 | 4.67 |
| 2004 | 130.00 | 0.417 | 5.11 |
| 2005 | 105.00 | 0.333 | 5.56 |
[86 FR 34514, Jun. 29, 2021]
['Air Programs']
['Air Emissions']
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