40 C.F.R. § 1054 app A to Part 1054
The following standards, which EPA originally adopted under 40 CFR part 90, apply to nonroad spark-ignition engines produced before the model years specified in § 1054.1 :
(a) Handheld engines.
(1) Phase 1 standards apply for handheld engines as summarized in the following table starting with model year 1997:
Table 1 to Appendix I-Phase 1 Emission Standards for Handheld Engines
[g/kW-hr]a
| Engine displacement class | HC | NOX | CO |
| Class III | 295 | 5.36 | 805 |
| Class IV | 241 | 5.36 | 805 |
| Class V | 161 | 5.36 | 603 |
a Phase 1 standards are based on testing with new engines only.
(2) Phase 2 standards apply for handheld engines as summarized in the following table starting with model year 2002 for Class III and Class IV, and starting in model year 2004 for Class V:
Table 2 to Appendix I-Phase 2 Emission Standards for Handheld Engines
[g/kW-hr]
| Engine displacement class | HC + NOX | CO |
| Class III | a 50 | 805 |
| Class IV | b 50 | 805 |
| Class V | c 72 | 603 |
a Class III engines had alternate HC+NOX standards of 238, 175, and 113 for model years 2002, 2003, and 2004, respectively.
b Class IV engines had alternate HC+NOX standards of 196, 148, and 99 for model years 2002, 2003, and 2004, respectively.
c Class V engines had alternate HC+NOX standards of 143, 119, and 96 for model years 2004, 2005, and 2006, respectively.
(b) Nonhandheld engines.
(1) Phase 1 standards apply for nonhandheld engines as summarized in the following table starting with model year 1997:
Table 3 to Appendix I-Phase 1 Emission Standards for Nonhandheld Engines
[g/kW-hr]a
| Engine displacement class | HC + NOX | CO |
| Class I | 16.1 | 519 |
| Class II | 13.4 | 519 |
a Phase 1 standards are based on testing with new engines only.
(2) Phase 2 standards apply for nonhandheld engines as summarized in the following table starting with model year 2001 (except as noted for Class I engines):
Table 4 to Appendix I-Phase 2 Emission Standards for Nonhandheld Engines
[g/kW-hr]
| Engine displacement class | HC + NOX | NMHC + NOX | CO |
| Class I-A | 50 | 610 | |
| Class I-B | 40 | 37 | 610 |
| Class Ia | 16.1 | 14.8 | 610 |
| Class IIb | 12.1 | 11.3 | 610 |
a The Phase 2 standards for Class I engines apply for new engines produced starting August 1, 2007, and for any engines belonging to an engine model whose original production date was on or after August 1, 2003.
b Class II engines had alternate HC + NOX standards of 18.0, 16.6, 15.0, 13.6 and alternate NMHC + NOX standards of 16.7, 15.3, 14.0, 12.7 for model years 2001 through 2004, respectively.
(3) Note that engines subject to Phase 1 standards were not subject to useful life, deterioration factor, production-line testing, or in-use testing provisions. In addition, engines subject to Phase 1 standards and engines subject to Phase 2 standards were both not subject to the following provisions:
(i) Evaporative emission standards as specified in §§ 1054.110 and 1054.112 .
(ii) Altitude adjustments as specified in § 1054.115(c) .
(iii) Warranty assurance provisions as specified in § 1054.120(f) .
(iv) Emission-related installation instructions as specified in § 1054.130 .
(v) Bonding requirements as specified in § 1054.690 .
40 C.F.R. 1054 app A to Part 1054