Sound regulations vary from place to place, So it is important to check with your local law enforcement to find out exactly what the allowable decibels are for your ATV. these laws are put into effect for good reason. It can not only be annoying to someone in their house who has to listen to it, but the loss of your own hearing is a factor as well.
For just $50.00, you can find out yourself what the decibel level of your ATV actually is. If you're a member of an ATV club, you may even be able to get other members to go in on the cost.
the first thing you'll need to buy is an analog sound level meter. That should run you approximately $35.00. if you'd like a unit of the bit more durable, there is a digital version available for around $60.00. The other thing that you'll need to buy, is attack, there. This is To be able to perform this test specifically at an RPM. A Tachometer should cost you somewhere around $20.00. you will want the kind of tachometer that has no need for a power source, and one in which a protruding wire acts as your reed. the wire will vibrate most heavily at your selected RPM. The farther from the unit the wire protrudes, the lower the RPM has been set. You'll most likely be able to purchase this from a lawn mower dealer.
If you own a four-stroke ATV with the stock bore and stroke, the proper RPM to select for you would be calculated by dividing 250,000 by the stroke of the motor in MM. If your ATV is a two-stroke, you should use 200,000. A good deal of ATVs will be approximately around 3000 to 4000 RPMS. for anyone who has an ATV without stocked war and stroke, you should divide your red line by two.
Now you'll need to grab a friend to help you operate the throttle as well as reading the tachometer for you. if you place the tachometer against the handlebars or the grab bar, you reading will be the same. With your friend keeping the proper RPM , you should hold a tape measure, as well as the sound level meter, and take your reading. For accuracy, try to take the reading in an open area which will not allow the sound to bounce. You want your meters sent to the "A" weighting, As well as the "slow" response time. Then you should dial in the decibel range. Keep your meter 20in. exactly from the exhaust at a 45° angle. Voila! You now have your decibel reading.
