I. No person shall operate in this state any motorcycle which produces a sound level in excess of the following decibels, when measured in accordance with the provisions of the SAE International Recommended Practice SAE J2825, “Measurement of Exhaust Sound Pressure Levels of Stationary On-Highway Motorcycles”:
(a) For all motorcycles, 92 decibels while the engine is operating at idle speed; or

Ask a traffic law question, get an answer ASAP!
Thousands of highly rated, verified traffic lawyers.
Parking violations, accidents, DUI/DWI, licensing, registration, and more
Protect your vehicle and your rights with expert legal help now
Click here to chat with a lawyer about your rights.

Terms Used In New Hampshire Revised Statutes 266:59-a


(b) For motorcycles with less than 3 or more than 4 cylinders, 96 decibels while the engine is operating at 2,000 revolutions per minute or 75 percent of maximum engine speed, whichever is less; or
(c) For 3 and 4 cylinder motorcycles, 100 decibels while the engine is operating at 5,000 revolutions per minute or 75 percent of maximum engine speed, whichever is less.
II. No person shall pass for the purposes of the inspection required by N.H. Rev. Stat. § 266:1 any motorcycle which produces a sound level in excess of the following decibels, when measured in accordance with the provisions of the SAE International Recommended Practice SAE J2825, “Measurement of Exhaust Sound Pressure Levels of Stationary On-Highway Motorcycles”:
(a) For all motorcycles, 92 decibels while the engine is operating at idle speed; or
(b) For motorcycles with less than 3 or more than 4 cylinders, 96 decibels while the engine is operating at 2,000 revolutions per minute or 75 percent of maximum engine speed, whichever is less; or
(c) For 3 and 4 cylinder motorcycles, 100 decibels while the engine is operating at 5,000 revolutions per minute or 75 percent of maximum engine speed, whichever is less.
III. Any person who violates the provisions of this section shall be guilty of a violation and shall be fined not less than $100 nor more than $300.