{"data":{"id":"us/40-cfr-1051.640","jurisdiction":"us","citation":"40 CFR 1051.640","heading":"What special provisions apply for custom off-highway motorcycles that are similar to highway motorcycles?","body":"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.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER U—AIR POLLUTION CONTROLS","PART 1051—CONTROL OF EMISSIONS FROM RECREATIONAL ENGINES AND VEHICLES","Subpart G—Compliance Provisions"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"bec061a1249e5907abed249ceffbf36e355c9872082d9852d8e56f768142a4aa","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-1051.635","next":"us/40-cfr-1051.645"},"notice":"GroundRules: Original legal text. Not legal advice."}