Due to the increased pressures by the government, both national and local, Motokazie is creating an opportunity to educate riders in hopes of conserving your personal riding areas as well as the local motorsports industry. Please see the link at the end of this page for several articles about the land closures and government actions to limit your rights to ride. It is Motokazie’s goal to educate and assist riders to meet current sound rules. We will have available at our events: exhaust packing, insert tips, instructions, test procedure info, and trained staff. We will also provide sound data on Motokazie.com.

99 dBa is the sound limit in 2010 (94 dBa in 2011)
Motokazie will be enforcing 99 dBa at practices as well as Supercross and Motocross races.

The 2010 American Motorcyclist Association sound rule, enforced by District 23 and Motokazie, is 99 decibels. Each machine is tested at a set RPM based on information from the manufacturer and the Motorcycle Industry Council. The test is taken 20 inches from the exhaust tip at a 45 degree angle. This test is called the SAE J1287. (SAE J1287 procedure guidelines)

In 2011 the AMA has decided to match up with the FIM and make 94 dBa, the maximum decibels for 4-stroke machines. On top of that, the AMA will be going to a standard RPM for the different size machines. Please note that this RPM is for quads and bikes. (2011 AMA rule)  

Motokazie SX testing rules.

2010 MK Supercross Series random sound testing rules. MK will use the standards put forth by the AMA (99dB/A) and will be enforced as follows:

Rule 2.1,
1st offense, 99.1-104dB/A rider is given the option to find an insert or different exhaust for that event. Rider is warned that 99db is the sound limit and given a handout with links for inserts, repacking or exhaust companies. Rider must make significant attempts to quiet their pipe by the end of the event to receive to receive points/awards. If no attempts are made to lower exhaust dB/A the rider will receive zero points and no awards for that event.

Rule 2.2,
2nd offense, 99.1-104dB/A rider is given the option to find an insert or different exhaust for that event. Rider is warned that 99db is the sound limit and given a handout with links for inserts, repacking or exhaust companies. Rider is given the opportunity to get below 99dB/A by the end of the event in order to get points. If by the end of the event the rider is over 99 dB/A, the rider will not receive points for that event. Rider is told they have 5 days to become compliant for future events (5 day grace period is to allow adequate time to order, have shipped, and installed). During the 5 day grace period, rider is allowed to ride but gets zero points/awards. After the 5th day, rider is no longer allowed to ride until they meet 99dB/A
Rule 2.3,
If 1st offense is 104dB/A or more, rider is given the option to find an insert or different exhaust for that event. If rider can not get below 104 dB/A before the races starts, they will not be allowed to ride. If rider can get in the 99.1 to 103.9 range they should refer to rule 2.1. Rider that tests over 104dB/A will not be allowed to ride any additional events until they meet the 99 dB/A rule.

Quieting the pipe you already have

There are several different options you have to reduce the sound output of your exhaust.

  1. Repack. The packing in all silencers needs changing just like engine oil. All silencers are different but typically they need to be repacked at 15-25 hours.

    FMF Repacking guide http://www.fmfracing.com/Content/techsupport/premierpacking.pdf
    Leo Vince repacking guide http://www.leovinceusa.com/main/support/X3-REFIT.pdf
    Yoshimura repacking guide http://www.yoshimura-rd.com/t-muffler.aspx?v=vid
    Dr. D repacking guide http://www.dubachracing.com/repacking.html

  2. Inserts. There are many different inserts you can put in your exhaust to quiet it down. Motokazie has a variety that we carry to all the races and many aftermarket exhaust companies sell inserts for the pipes they manufacture. Generally, anything bigger than 1.5 inches at the exhaust exit will not pass.

Yoshimura inserts http://www.yoshimura-rd.com/t-replacement_inserts_offroad_atv.aspx?imsec=offroad    

Aftermarket exhaust
If you want the performance gains of an aftermarket exhaust, make sure the pipe meets the 2011 94dB/A standard. Most manufacturers are currently producing exhaust systems that meet 2011 standards but some are behind the curve. Make sure the manufacturer stands behind or guarantees its dB/A rating. All pipes should come with, or you should be able to purchase, different inserts for more tuning options. As the summer progresses, MK will have a chart of various pipes testing results to help you better decide what to buy. (What pipes are passing)  

Links to articles of property closures and government actions

Oak Grove, MN http://www.freewebs.com/oakgroveridersclub/cityordinances.htm
Minnetrista, MN http://www.waconiapatriot.com/articles/2009/11/06/the_laker/news/news02.prt
Mille Lacs, MN http://millelacscountytimes.com/index.php?option=com_content&task=view&id=2837&Itemid=87
Chisago City, MN http://www.chisagocountypress.com/main.asp?SectionID=1&SubSectionID=1&ArticleID=12019&TM=59973.25