I purchased a power tip for my 2007 DRZ400S. Do you know DB levels??
I am planning on going on a ride and if the exhaust is too load I will not be
allowed and will have spent $ 1000.00 in traveling expenses for nothing
Thank you for your help Frank
Here are there requirements
Sound is our biggest enemy. Even a quiet bike is a disturbance to non-riders in
the forest, and they are vocal with the overseeing governmental agencies. Once
again, clubs & promoters are put on the spot, and other riders must face the
consequences of your actions.
Ted’s equipment is professional grade, and calibrated fairly regularly. Ted has
tested thousands of bikes over the years, creating a baseline from which to
Microphone placement is very important. Imagine a line drawn in space that
starts at the tip of the exhaust and extends out at a 45° angle from the long
axis of the bike and is level with the ground. We place the tip of the
microphone of the sound level meter (SLM) 20” away from the exhaust tip, and
hold it perpendicular to that imaginary line. So the SLM is facing basically
backwards relative to the bike.
Ted will test the sound level when the bike is at 3400 rpm, which is about half
the redline rpms for most 4-stroke singles. This is per AMA and PNWMA sound
check guidelines, which recommends 3400 rpm as a good engine speed for most
bikes. We have a device that can tell us when the engine is at that speed and
all we have to do is put it in contact with the bike. If you have a tach, we
go by that number.
The DualSportBC limit is 96 dBA. If you have an unmodified stock muffler in
good condition and it is at or below that number (keep in mind that the sound
level doubles every 6 decibels, so a little bigger number is a lot louder), we
pass the bike. If the muffler is in sad shape, or you have an aftermarket
exhaust and are above the limit, then you have to go make some changes (remove
discs or repack) and be retested in order to pass. Our intention is to PASS,
not fail bikes. We want everyone to get out & ride. Please work with us…