43 CFR § 420.11
Requirements—vehicles
June 11, 2020
Each off-road vehicle that is operated on Reclamation lands shall meet the following requirements:
(a) It shall conform to applicable State laws and vehicle registration requirements.
(b) It shall be equipped with a proper muffler and spark arrestor in good working order and in constant operation. The spark arrestor must conform to Forest Service Spark Arrestor Standard 5100-1a, and there shall be no muffler cutout, bypass, or similar device.
(c) It shall have adequate brakes and, for operation from dusk to dawn, working headlights and taillights.