OAR 736-004-0160: Noise Control Regulations for off-road vehicles

(1) All-terrain Vehicles: (a) No person shall operate any all-terrain vehicle which exceeds the stationary noise level limits specified: (A) A maximum noise level of 96 dBA when subjected to a stationary test as prescribed by SAE J-1287 (2017) for Class I and III ATVs. (B) A maximum noise level of 96 dBA when subjected to a stationary test as prescribed by and J-1492 (2023) for Class II and IV ATVs. (b) No person shall operate an all-terrain vehicle with any of the following defects: (A) No muffler; (B) Leaks in the exhaust system; (C) Pinched outlet pipe; (D) Muffler cutouts, bypass valves, defeat devises or exhaust modes are prohibited to be activated unless they are compliant with applicable noise and emission control regulations. (c) A person commits the offense of causing unreasonable noise with a vehicle if the person operates an all-terrain vehicle so as to cause any greater noise or sound than is reasonably necessary for the proper operation of the vehicle. (2) Noise Control Regulations for Motor Sports Vehicles and Facilities: All-terrain vehicles used in organized racing events in an area designated for that purpose shall comply with the motor sports vehicles and facilities regulation in OAR 340-035-0040.