"4519.20 Rules for equipment of snowmobiles, off-highway motorcycles, and all-purpose vehicles.
(4) A muffler system capable of precluding the emission of excessive smoke or exhaust fumes, and of limiting the engine noise of vehicles. On snowmobiles manufactured after January 1, 1973, such requirement shall include sound dampening equipment such that noise does not exceed eighty-two decibels on the "A" scale at fifty feet as measured according to SAE J192 (September 1970)."
http://codes.ohio.gov/orc/4519
"According to Purdue University, 80 decibels (dB) is approximately as loud as a garbage disposal or a dishwasher. "
https://www.reference.com/science/loud-80-decibels-55b434cc4de10d3c
85 decibels is equivalent to a passing diesel truck. A lawn mower puts out about 90 decibels.
https://www.noisehelp.com/noise-level-chart.html
"MOTORCYCLE EQUIPMENT
Each rider must ride on a permanently attached regular seat.
Each rider must wear safety glasses or other protective eye device.
No person who is under the age of 18 years, or who holds a motorcycle operator’s endorsement or license bearing a “novice,” shall operate a motorcycle on a highway, or be a passenger on a motorcycle, unless wearing a protective helmet on his or her head, and no other person shall be a passenger on a motorcycle operated by such a person unless similarly wearing a protective helmet."
"MOTORCYCLE NOISE LIMITS
When operated at a speed of 35 mph or less, the maximum noise limit is 82 decibels based on a distance of not less than 50 feet from the center of the line of travel.
When operated at a speed of more than 35 mph, the maximum noise limit is 86 decibels."
https://drivinglaws.aaa.com/category/us-motor-laws/ohio/
For less then $20, you can buy a decibel meter from Amazon.
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