Tag Archives: sound testing

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

Sound Measuring Equipment

DPS Technical supports responsible OHV recreation and believes that excessive sound levels are a main cause of complaints against the sport.

Since 2004 DPS Technical, Inc. has supplied equipment and training for hundreds of OHV law enforcement officers and civilians throughout North America and these dedicated individuals perform sound level tests when possible.

A need for more citizen involvement in voluntary OHV testing has been identified. To remedy the lack of equipment for citizens to provide voluntary OHV sound level testing, DPS is implementing a Sound Testing Equipment Kit Program.  The testing kit includes a Calibrated Type ll sound meter, tachometer, tape measure, storage box and other items necessary to perform spark arrestor inspections, or the SAE 1287 OHV field sound test or the SAE 2825 On Highway Motorcycle sound test procedure.

For further information on the program or to apply contact DPS Technical, Inc. – Chris Real at (909) 981-5228.

DPS Technical also has sound measurement training classes for civilians and law enforcement personnel. Many of the classes are held under contract and sponsored by The State of California OHV Division. To receive information on our training schedule in your area contact DPS Technical for details.

Chris Real, CLS   President
DPS Technical, Inc.
1160 Dewey Way, Suite D
Upland, CA 91786
(909) 981-5228 T

Dirt Rider – Sound Testing the Big Bore 4-Strokes



In the very near future, noise will be an enforced competition rule, period. This is what the experts tell us. Some people argue that a “closed course” machine should not be subject to strict noise limitations. However, noise regulations for competition have been on the books for a long long time. The popularity of big bore four strokes has brought the issue of noise up to the forefront of land use discussions, even on private property. Another reason for considering noise is because most motocross bikes eventually find there way to the open country and can make serious impressions on neighbors and voters. The fact that noise in our sport could drastically limit where and when we can ride, should cause us all concern.

Starting in the later part of this year, 2003, DPS Chemhelp will have a Tech Inspector Certification Class on environmental protection, and noise abatement. About a third of the class content will be on general environmental awareness and mitigation relating to fuels, oils and chemicals. The other two thirds of the class will be set to certify a Tech Inspector on how to properly perform a sound check. Upon completion of the course, you will get a certificate, a card, a reference book, and there will be some other perks associated with the certification. This class will be on a National Schedule, and have various sponsors to be announced. The class will cost less than a hundred dollars, and will have various co-op sponsors that could really bring the price down. We do know already that the Honda Riders Club has offered some assistance. Chemhelp will be at various events throughout the year doing complimentary sound checks. Chris will also offer clinics on how to repack and service silencers.

Many thanks from Dirt Rider to Chris Real for his help in this sound testing and education. For more info on Chris Real, his sound technology, and other environmental issues, visit him at www.chemhelp.com.

Read more: http://www.dirtrider.com/features/141_0309_four_stroke_sound_test/#ixzz2yK9Hi6Gh

Sound Testing for a New Motorized Recreation Facility

Private R&D Function


The facility sound study that the ChemHelp team did at the proposed Sun Valley motorized recreation practice track was viewed by the media.  We will know more after the data has been reviewed and presented to the community, however, the scientific data is favorable.

A copy of the final report will be presented in the near future.

Track operator:  jfoley2000@earthlink.net

Best regards,

Chris Real
DPS Inc. – ChemHelp
(909) 981-5228