"Make a better effort" for a less noisy future!

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Less Sound = More Ground MANDATORY NOISE TESTING FOR 2004 In 2003 we conducted a noise test as part of the technical inspection. During 2003 the AMA and many of the states implemented a noise limit of 96 dBa for off-road bikes. Our limit for 2003 was 99 dBa maximum. For our 2004 ride. we have reduced the limit to 97 dBa. The tests will be conducted PRIOR to picking up your Riding Number. You will present your bike for Sound Test and after you have tested below 98 dBa we will place a numbered seal on your bike's exhaust and give you a "Passed" card to take to the next inspection station. 98 dB or more is an invite to go back to the truck and work on it! You can contact Stan Simpson if you have questions about your bike's noise level. TEST INFORMATION We will use certified Type 1 and 2 sound meters that have been calibrated by a lab. We will use the test procedure from SAE that applies to off-road motorcycles. ( SAE J 1287-1998 ) The sound meter will be placed at a 45-degree angle rearward from the outlet of your exhaust system and 20" away- (level with the exhaust outlet). The rider will stay sitting on the bike with both feet on the ground. The RPM will be raised to the prescribed level and held constant by the testing engineers. The RPM rating will be according to the Motorcycle Industry Council's table for off-road bikes (Updated May 9, 2003) (see table below) After your bike passes the 97 or less sound level (using the A scale on slow response) we will install a seal on the silencer or insert portion of your exhaust system. This is your approval to ride the event. During the week's ride we will spot-check a few of the bikes to see if the sound level has stayed below 97! We know no one would change exhaust systems and not be able to ride the rest of the run! Take a look at the Table of Bikes listed to see what RPM your bike will be tested at when you present it. If you have an aftermarket system or the insert removed, you should test your bike before you travel all the way to Basalt! Your local motorcycle dealer can help you or we can help you find a method to get your bike tested before the event. Let us know if your bike is not listed in the sample table we supplied. We can email you a copy of the MIC RPM chart if you need it. If you need to test your bike and can't find anyone locally, we can supply the test equipment if you pay the UPS charges to and from your location. You can email us if you have questions! The test crew for 2004 will include: Stan Simpson - 210 861 4993 Vernon Markworth - 830 537 5248 Will Hendrix   If you think your bike will test over the limit we can assist you in methods to reduce the noise level before you transport to Basalt. Send an e mail to Stan@StanSimpson.net and we can help walk you thru the things you can do to improve your bikes exhaust system.   EXCERPT from MIC 2001-2003 Model Year Test RPM Data(Updated 5/9/2003) BRAND MODEL Engine Size RPM Setting HONDA XR 200 200 4000 CRF 230 230 3650 CRF 250X 250 5000 XR 250 250 3500 XR 250 (CA) 250 4000 XR 400 400 3750 CRF 450 450 4500 XR 600 600 3000 XR 650 R 650 3250 XR 650 L 650 3000 KAWASAKI KDX (pre 2003) 200 4000 KDX (2003) 200 3500 KDX 220 (pre 2003) 220 3750 KDX 220 (2003) 220  3500 KX 250  4250 500  3500 KLX  300  3500 400B  3750 400A  4000 650  3250 KTM  EXC/MXC 200  4000 250  3750 300  3550 380  3550 400  4625 450  4625 520/525 4600 LC4 640  3450 SUZUK1  DR/DRZ 200  4250 250  4000 400 E 4000 400S/E 3750 DR  650  3250 YAMAHA  TTR  225  3750 250  3750 XT  225  4000 WR  250  5250 426  4250 450  4500 YZ  250  4250 YZ F 250  5250 426  4500 450  4500 * If your bike & model is not listed here, let us know and we can give you the RPM. Related Stories: AMA Position on Excessive Motorcycle Noise Is Noise Killing Off-Road Access? State of Colorado - Motorcycle Noise Levels