[Code of Federal Regulations] [Title 40, Volume 31] [Revised as of July 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR1051.640] [Page 659] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 1051_CONTROL OF EMISSIONS FROM RECREATIONAL ENGINES AND VEHICLES--Table of Contents Subpart G_Compliance Provisions Sec. 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]