Require QUIET exhaust system for CA, Please assist.
Posted June 09, 2002 - 10:26 AM
I went to Georgetown on Friday and was harassed again. I should have known better, I raced the Fools Gold Enduro there in May and was required to run my CORKED stock pipe...
My White Brother’s R4 tested off the pipe at 106db.
My uncorked Stocker tested 102db and 98db corked.
My buddies ‘02 YZ426F with FMF Q and Powerbomb header tested 101db.
I need a "Confirmed" setup that will test under 100db and according to the Ranger it will need to be at 98db for the 2003 race season...
Does anyone know if rubber mounted bars and anti- vibration bar inserts can contribute to a false RPM/DB test result...?
Any assistance would be appreciated.
Posted June 09, 2002 - 10:53 AM
Posted June 09, 2002 - 12:26 PM
Posted June 09, 2002 - 04:44 PM
Having the motor noise sheilded by your legs matters.
Having a consistent testing regimen is perhaps the most important thing that would come from all these inconsistencies.
Posted June 10, 2002 - 03:30 AM
There is a advertisement in the July Dirtbike mag on pg6.
Posted June 10, 2002 - 03:47 AM
Posted June 10, 2002 - 04:33 AM
That was an 01 WR426 grey wire mod, airbox top removed, stock timing, stock header, WB E-Series freshly repacked with silent sport packing and 8 disc.
Had my Husaberg 02 FE501e tested stock 91.2 at Hollister last weekend. They were doing a vollentary testing and if you passed you got a special sticker put on your green or red sticker to notify other rangers that you past testing. This sticker is good for the same amount of time as the green sticker. If you get retested and they find you have changed exhaust you can get fined.
Ride Safe, Ride Often & Have Fun
Posted June 10, 2002 - 05:52 AM
Something is very wrong with the test procedure or equipment for a STOCK exhaust to be measured that high.
Posted June 10, 2002 - 07:24 AM
Matt at Stonyford tested my bike in March with similar results, at the time it was just sampling, not a requirement. My uncorked stock still exceeded 100db
I really need to find a resolution in order to continue racing District 36 and riding in Nor Cal. G-town, Wilseyville and Foresthill are all testing recreational riders now and require 101db or less to ride. No Pass, No Ride....
I appreciate all your comments.
Ride safe, Ride another day...
Posted June 10, 2002 - 08:54 AM
Posted June 10, 2002 - 09:18 PM
Our friend Ranger Matt at Stoneyford was kind enough to let me put my stock pipe back on my bike.
I had an Arrow that was quiet and I had put a sparky core inside of it for a SA.
No stamp, no good.
I won't try that again.
Posted June 10, 2002 - 10:28 AM
Posted June 10, 2002 - 12:17 PM
Posted June 10, 2002 - 03:30 PM
By Bill Dart, AMA District 36 Legislative Officer
...the popular Yamaha 400/426 series. While right on the margin of legality, they are still too noisy right out of the crate. But the problem really gets bad when an aftermarket exhaust system is installed, which it seems about 90% of these bikes have today. Dirt Rider magazine did testing for power and sound levels on all of the popular exhaust system available for the Yamaha 400/426 series, as well as the new Suzuki DRZ400. According to their testing, the Yamaha measured 100 db stock, barely within the 99db, plus or minus 2 db, mandated by California law. But none of the aftermarket pipes tested came in below 102db, and most were between 104 and 106 db. This means that NONE of the aftermarket pipes for the 400/426 are legal to use anywhere on public lands in California, not even for racing.