40 CFR § 1051.640 - What special provisions apply for custom off-highway motorcycles that are similar to highway motorcycles?

---
identifier: "/us/cfr/t40/s1051.640"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 1051.640 - What special provisions apply for custom off-highway motorcycles that are similar to highway motorcycles?"
title_number: 40
title_name: "Protection of Environment"
section_number: "1051.640"
section_name: "What special provisions apply for custom off-highway motorcycles that are similar to highway motorcycles?"
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"
---


# 1051.640 What special provisions apply for custom off-highway motorcycles that are similar to highway motorcycles?

You may ask to exempt custom-designed off-highway motorcycles that are substantially similar to highway motorcycles under the display exemption provisions of 40 CFR 86.407-78(c). Motorcycles exempt under this provision are subject to the restrictions of 40 CFR 86.407-78(c) and are considered to be motor vehicles for the purposes of this part 1051.

[69 FR 2445, Jan. 15, 2004]