TITLE XXI MOTOR VEHICLES CHAPTER 266 EQUIPMENT OF VEHICLES Miscellaneous Section 266:59-a     266:59-a Motorcycle Noise Levels. —     I. No person shall operate a motorcycle which has a measured noise level of more than 104 decibels on the decibel meter when measured 20 inches from the exhaust pipe at a 45 degree angle while the engine is operating at 2,800 revolutions per minute for one and 2 cylinder motorcycles and 3,500 revolutions per minute for any motorcycle with 3 or more cylinders.       II. No person shall pass for the purposes of the inspection required by RSA 266:1 any motorcycle which has a measured noise level of more than 104 decibels on the decibel meter when measured 20 inches from the exhaust pipe at a 45 degree angle while the engine is operating at 2,800 revolutions per minute for one and 2 cylinder motorcycles and 3,500 revolutions per minute for any motorcycle with 3 or more cylinders.     II-a. No person shall operate in this state any motorcycle which produces a sound level in excess of 104 decibels on the A scale, when measured in accordance with the provisions of the Society of Automotive Engineers Recommended Practice ANSI/SAE J-1287 annual report on "Measurement of Exhaust Sound Levels of Stationary Motorcycles.'     III. Any person who violates the provisions of this section shall be guilty of a violation.   Source: State of Colorado proposed rule dated June 12, 1999.   Related Stories: Less Sound = More Ground AMA Position on Excessive Motorcycle Noise Is Noise Killing Off-Road Access?