40 CFR § 1051.5 - Which engines are excluded from this part's requirements?
---
identifier: "/us/cfr/t40/s1051.5"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 1051.5 - Which engines are excluded from this part's requirements?"
title_number: 40
title_name: "Protection of Environment"
section_number: "1051.5"
section_name: "Which engines are excluded from this part's requirements?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "U"
subchapter_name: "AIR POLLUTION CONTROLS"
part_number: "1051"
part_name: "CONTROL OF EMISSIONS FROM RECREATIONAL ENGINES AND VEHICLES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401-7671q."
regulatory_source: "67 FR 68347, Nov. 8, 2002, unless otherwise noted."
cfr_part: "1051"
---
# 1051.5 Which engines are excluded from this part's requirements?
(a)(1) You may exclude vehicles with compression-ignition engines. See 40 CFR parts 89 and 1039 for regulations that cover these engines.
(2) Vehicles with a combined total vehicle dry weight under 20.0 kilograms are excluded from this part. Spark-ignition engines in these vehicles must instead meet emission standards specified in 40 CFR parts 90 and 1054. See 40 CFR 90.103(a) and the definition of *handheld* in 40 CFR 1054.801.
(b) We may require you to label an engine or vehicle (or both) if this section excludes it and other requirements in this chapter do not apply.
[70 FR 40486, July 13, 2005, as amended at 73 FR 59245, Oct. 8, 2008]