(a) This part applies to you if you manufacture or import new, spark-ignition, nonroad engines (defined in §1048.801) with maximum brake power above 19 kW, unless we exclude them under §1048.5. See §1048.20 for the requirements that apply to excluded engines.

(b) If you manufacture or import engines with maximum brake power at or below 19 kW that would otherwise be covered by 40 CFR part 90, you may choose to meet the requirements of this part instead. In this case, all the provisions of this part apply for those engines.

(c) As noted in subpart G of this part, 40 CFR part 1068 applies to everyone, including anyone who manufactures, installs, owns, operates, or rebuilds any of the engines this part covers or equipment containing these engines.

(d) You need not follow this part for engines you produce before January 1, 2004, unless you certify voluntarily. See §§1048.101 through 1048.115 and §1048.145 and the definition of model year in §1048.801 for more information about the timing of new requirements.

(e) See §§1048.801 and 1048.805 for definitions and acronyms that apply to this part. The definition section contains significant regulatory provisions and it is very important that you read them.