AMA Sound Testing

District 23 sound test procedure

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AMA District 23 sound testing procedures for all off-road events.

Cambridge Sprint Enduro Dual Sport Adventure Ride Mora Enduro Trollhaugen Hare Scrambles

Cambridge Sprint Enduro

Simply put, Sprint Enduro is individual off-road motorcycle racing, against the clock. May 5, 2019!


Picture grass track combined with some great trails, and you holding it wide open for 6-10 minutes trying to do a lap as quick as possible. This is an Enduro, so you're racing against the clock, not head-to-head against other riders.

MN300 Adventure Ride

The MN300 Adventure is a is a 2 day adventure ride through the Walker/Leech Lake area in northern MN. The route consists of two loops, each approximately 150 miles of great fall colors on dirt roads, paved roads and trails from Northern Lights Casino in Walker, MN, through many forest roads, snowmobile, and ATV trails in the area.

On-line REGISTRATION CLOSES 9/28/2019 or when 100 riders have registered.

Mora Enduro

The Norsemen Motorcycle Club has been sponsoring the Mora Enduro in the Snake River State Forest for over 60 years! This Enduro is the only time you can ride the trails in this forest, don't miss it! July 14, 2019 for the Main Enduro and a Youth Enduro July 13, 2019 paying Youth Cross Country Series points.

Trollhaugen Hare Scrambles

This Hare Scrambles is held at the Trollhaugen Outdoor Recreation Area in Dresser, WI. The course includes a woods course and  moto track. Don't miss out on the fun July 28, 2019!

Trollhaugen Memorial Race Track in Dresser, WI will be rocked for this legendary, once a year spectacle! The infamous Area 51 will give riders thrills and chills as they try to conquer the hills at the Troll. Four races for riders of every age, size and ability.

Cambridge Hare Scrambles Minnesota 300 Adventure Ride Mora Enduro TT Flat Track Trollhaugen Hare Scrambles
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Over 60 years sponsoring quality events
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Sound Testing

The Motorcycle Industry Council has put out a manual "Stationary Sound Test Manual" for off-highway motorcycles and all-terrain vehicles which has become the standard as far as AMA is concerned. Included here is the pertinent information regarding sound testing requirements for District 23 off-road events. It is up to each individual rider to know the rules and requirements PRIOR to showing up for an event. If you have any further questions regarding sound testing, send an e-mail to Jay or call 763-263-9835.

**Remember, the noise limits are not just enforced during events, there are laws in place now for riding on both private and public lands. Check the laws at the State and County levels before you ride.


  • Let's face it, noise annoys.
  • Know the sound limits where you ride.
  • Maintain your exhaust system. Remember that noise doesn't equal horsepower. Too little exhaust back-pressure can actually cause less power and engine damage.
  • Keep your RPM and speed down and steady when you're around non-riders.
  • Always use a spark arrestor. It doesn't sacrifice power, but can save the forest from fires.
  • Protect your right to ride.

Less Sound = More Ground

These are the basic rules followed by AMA District 23 events:

  • The area for sound testing must be 30' from buildings, vans, motor homes, trailers or any other sound reflecting surfaces.
  • Sound testing requires at least two (2) people. One person to control the sound meter and the other to work with the tachometer.
  • Set the sound meter to 'Slow Response' and the 'A Weighting Scale'.
  • Nobody should be within 15' of the machine being tested other than the rider and the sound testers.
  • When testing in winds above 20 mph position the machine so the wind direction is parallel to the normal direction of the vehicle, exhaust down wind.
  • The machine must be in neutral. Rider must be on the machine with both feet on the ground (ATV riders feet can be on the foot rests). The machine must be vertical, stationary, and in neutral.
  • Sound meter is to be held at a 45° angle to the exhaust centerline, parallel to the ground and 20" to the rear of the exhaust outlet at the same height as the exhaust outlet.
  • Sound testing tablesDetermine the RPM for make, model and year from the Motorcycle Industry Council tables. Set vibrating tachometer to test the RPM's.
  • Tachometer operation for sound testing dirt bikeHold tachometer flat on rear fender with your index finger in the center of the tachometer.
  • The tachometer operator must be in a position to hold the tachometer on the rear fender and operate the throttle simultaneously.
  • The sound meter operator must be positioned on the same side as the tachometer operator with their right foot positioned so that the tachometer operator can tap the top of the sound meter operator's foot when the target testing RPM is attained. (yelling potentially could affect the reading)
  • Tachometer registering RPMWhen the tachometer has reached the target RPM, the oscillating wire on the tachometer will swing in a figure eight (8) configuration. There are some machines, like small four-strokes, which don't vibrate much. These machines are tested when the yellow loop (at the end of the wire) is at its widest arc (when it is vibrating the most). *NOTE: Some small four-strokes have a vibration spot just off idle, this will give a false reading.
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