Quote:
Originally Posted by 517snowman
NO IT IS NOT
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If your going to ride.. Read the rules!!!!
DNR - Michigan Snowmobile Regulations....
Old law...Noise: Each snowmobile manufactured after July 1, 1977, shall be equipped with a muffler that does not exceed 78 decibels of sound pressure at 50 feet as measured by the 1974 SAEJ-192a.
New law...Jan. 2004 SAE J2567 stationary test overview: The sound meter microphone is placed 4 feet above the ground, inline with the exhaust outlet/center point of multiple exhaust outlets, on the side of the snowmobile toward which the exhaust is directed, 4 meters distance from the snowmobile longitudinal centerline. The operator holds the brake during the test, starts and runs the engine up to normal operating temperature, then slowly opens the throttle until a steady 3,750 to 4,000 rpm is achieved for not less than 4 seconds. The test is immediately repeated and the two readings averaged.
Michigan's quieter snowmobiles will please some Michigan Outdoors - MLive.com
JT
