Tag Archives: spark arrester

Sound – Winter 2014 Update


1. What are the road side or trail side sound test procedures?

The sound test procedure for Motorcycles, ATV’s, ROV’s and  MUVs is SAE J1287. This is a stationary testing method where the measurement is taken close to the vehicle.

This procedure is outlined in numerous vehicle operational codes and in sporting regulations.

SoundFAQ1a SoundFAQ1b

On Highway Motorcycles and Dual Sport Motorcycles – These vehicles are becoming very popular. The testing procedure for these on highway legal vehicles is covered in the SAE Test procedure, SAE J1287.

On Highway Motorcycles “Street Bikes”  – Be advised that an SAE test procedure has been developed specifically for On-Highway motorcycles. The test procedure is SAE J2825.
(Technical report issued, summary available upon request) (Video: http://www.youtube.com/watch?v=2KdYUhH3JSo)

SoundFAQ1c P100117 v118-6 PassCar-MS.indd

2.  Are new designs of vehicles required to be noise compliant?

SoundFAQ2a SoundFAQ2b

Yes, Side by Side ATV’s also known as ROV’s  “Recreational Off Highway Vehicles” / MUVs “Multi Use Vehicles” are becoming very popular.

These vehicles are subject to the same noise and spark arrester regulations as other OHV’s and the test procedures and sound limits apply.

 It is possible that these Off-Highway vehicles may have On Highway / limited street use privileges in some communities, therefore, noise control levels for street registered vehicles apply.    (Video Available)

Other Street / On Highway registered vehicles such as Jeeps and Sand Rails and Hot Rods must conform to noise control and adequate muffler requirements.

Refer to the appropriate vehicle code sections.  The sound measurement test procedures are published by the SAE.

For California and many other states and sections of Canada the common automotive roadside sound test methods for automobiles are SAE J1169 or SAE 1492, or the ISO counterpart.  This is a 20” test method and is very similar to the sound testing methods utilized for Off Highway Motorcycles and ATVs / MUVs. (Video available)

SoundFAQ2c SoundFAQ2d

 3. Are Mufflers and a Spark Arresters the same thing?

SoundFAQ3a SoundFAQ3b

No, Off Highway Vehicle exhaust systems have several components.  First is the Muffler. The muffler is for reducing the sound level.

The second component is often a Spark Arrester.

The Spark arrester is intended to minimize the potential for discharging particulates that can be an ignition source.  These are individual components often.  Each component requires maintenance to function properly.

4. What are the sound measuring equipment requirements?

For Enforcement purposes, an ANSI Type 1 instrument is needed.  The “evidence level” instruments require calibration to be utilized for evidence gathering purposes.   When selecting instruments, be sure to consider the required performance level and calibration maintenance costs.  The evidence equipment calibration term is yearly.

For Awareness measuring purposes, an ANSI Type 2 instrument is suitable.  These instruments are frequently utilized by trail volunteers and clubs.  These instruments when calibrated and used by trained personnel provide reasonably accurate data.  These instruments have a recommended calibration term of every other year.

5. Are sound measuring equipment programs available?

Yes, several equipment programs are available, ranging from equipment accuracy verification programs (Calibration) and “loaner” equipment kits for special events.

Complete sound measuring instrument kits are available for purchase.

 6. How do you get more information or training?

Instruction and training for noise control is available.  DPS Technical coordinates these training sessions.  Currently a schedule of live on location classes is being developed for the season.

A web based training module is available as well as several field training refresher and outreach sessions.

In the event your agency needs people trained please send an e-mail to us and we will send you the training schedule.


It is my hope that this information is beneficial. In the event you require more information, please do not hesitate to contact me directly.


Chris F. Real, CLS
President, DPS Technical, Inc.






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King of the Motos – 2012


RE: 2012 King Of The Motos                                                     February 8/9, 2012

In conjunction with the King of the Hammer’s off road event an extreme off road motorcycle race took place, “King of The Moto’s”.  This race was by invitation only and was attended by many of the top international off road racers.  For information on the KOH event visit www.ultra4racing.com.  This is truly an amazing world class special off road event.

DPS Technical provided environmental protection and technical inspection for the 2012 King Of The Motos extreme off road motorcycle event.

As one of the service providers we performed the sound check and spark arrestor inspection portion of the technical inspection on each motorcycle and coordinated the remote fueling areas.

Technical inspection was held in the K.O.M sign in area.  Each motorcycle entered received a vehicle inspection that included a visual inspection of safety related components and controls.  We performed an inspection of the muffler and spark arrestor and conducted an SAE J1287 stationary sound test (96 dBA Maximum limit).  No vehicles were allowed to start without passing technical inspection.

At the conclusion of the event finishing motorcycles were inspected for compliance.  Our inspection noted that none of the motorcycles had been tampered with and all were found to be in compliance.

As part of our service we instructed each rider on the required remote pit stop fueling procedure.  We also provided verbal instructions to each fuel pit team and provided written instructions and the procedure for each Pit Captain on how the fuel area was to be setup and managed.

I personally visited a fuel pit area and observed the fueling areas and I am satisfied that the fuel areas were properly managed.  It should be noted that land management staff also viewed several of the fueling areas and observed the procedures and had no negative comments.

I am looking forward to next year.

Chris F. Real, CLS
President, DPS Technical, Inc.

Spark Arrestor Inspection                      (Performed by Chris Real)

  • Visual inspection and probe check. Qualified USFS / USDA Spark arrestors only.

Sound Test                                              (Performed by Chris Real)

  • SAE J1287 (20” Method) 96 dBA Maximum to start. Instruments were calibrated ANSI Type 1 instruments.

KingMoto1 KingMoto2


Fuel Staging & staff training area.


Fuel Stop


Rider’s procedure meeting.

 Additional photos can be found in our album
King of the Motos 2012