Almost all aftermarket pipes are illegal in NH now?

[Fitz]

FWIW milford was using a db meter to assess the level of noise. I haven't had a chance to research the RSA number but in NH there is a decibel limit, measurement protocol etc... I can't quote numbers and distances but I do know when it came up in conversation with my inspection station it seemed reasonable to me from a volume standpoint. 96db comes to mind, although like I said, I can't quote an RSA number.

Fitz

[RandyO]

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 106 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 106 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 106 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 and shall be fined not less than $100 nor more than $300.
Source. 1992, 94:1. 1993, 9:1, eff. May 25, 1993. 2005, 266:2, eff. Aug. 21, 2005.

[Fitz]

Thanks!

106 decibels is damn loud; especially when the bikes are being measured at ONLY 3,500 rpm and in an unloaded state (neutral).

Fitz

[RandyO]

Thanks!

106 decibels is damn loud; especially when the bikes are being measured at ONLY 3,500 rpm and in an unloaded state (neutral).

Fitz

I think NH's law is liberal, especially for high revin sport twins

my SV with a 102,000 mile old V & H full system (all the innards has long ago rusted, melted or what ever they do and were blown out in bits & pieces)

was a legal 104-105 @ 2800rpm for the SV, that's really just a high idle, you can't ride it in gear at that low of an rpm. At 5000rpm & up, I could compete with any straight-piped harley for volume