Montana · Montana Code Annotated — Title 61, Motor Vehicles
MCA Title 61 § 61-9-418: Motorcycle and quadricycle noise suppression devices -- motorcycle and quadricycle spark arrester
What this law says, in plain English
Motorcycles and quadricycles on state streets and highways must have working mufflers and meet specific noise limits by manufacture year (70–92 decibels at 50 feet). Off-highway operation requires spark arresters and noise under 96 decibels, except permitted special events.
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