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Found this on the AMA site.
NH Road Laws
Safety Helmet: Required by law under age 18
State Funded Rider Ed: Available for all eligible applicants
Eye Protection: Required by law unless equipped with windscreen
Daytime Use of Headlight: Modulating headlight permitted
Passenger Seat: Required if carrying a passenger
Passenger Footrest: Required if carrying a passenger
Passenger Age Restriction: None
Helmet Speakers: No Restrictions
Periodic Safety Inspection: Required by law
Mirror Left(L) Right(R): Required by law
Radar Detector: No Restriction
Turn Signals: Not Required
Muffler: Muffler required.
Maximum Sound Level: Max sound level of no more than 106dBA when measured 20 inches from the exhaust pipe at a 45 degree angle (Title 21, Chapter 266:59-a)
State Insurance Requirements: Compulsory Liability (Minimum Limits)(25/50/25) - Financial responsibility required. Persons under 18 must show proof of insurance when applying for driver's license.
Handlebar Height: Handle bar grips cannot be higher than the shoulder level of the driver when in the seat or saddle.
Rider-Education Waiver: Skill Test
Accept Motorcycle Endorsement From Other States: Yes
Accept RiderEd Completion Card From Other States: N/A