noise limits

All bikes have to have a noise label on them showing their dB reading at
particular RPM.. (50% of peak power) and there is an applicable ADR39
which states that maximum allowable sound level for a new motorcycle is
94dB, but then bikes like my Buell have stickers stating that it was
tested at 96dB and I was in the bike shop the other day poking my nose
around and the new GSXR600 says 100dB and the GSXR750 says 102dB. How
do they pass ADR when they're obviously not within the ADR limits? What
am I missing here?

Nev..
'07 XB12X

 

In aus.motorcycles on Sat, 12 Apr 2008 23:11:45 +1000

And the later ones...

You are missing that fact that ADR39 is old

New bikes are conforming to a Euro standard about driveby rather than
stationary sound limits. Which are allowed in new ADRs. Driveby
limits can be louder, and they also include other noises in the mix -
so a bike can be very quiet in say valve noise[1] and so have a louder
pipe to compensate.

NSW didn't update their regs to allow for new ADRs leading to the
situation that, until recently, a brand new bike could be illegally loud
in NSW.

Zebee

[1] unlike my 850T which was famously 95db at the pipes and 91db at
the tappets... A rattley tappet is a happy tappet!

 

There is no way anyone is going to rev my old machine out to 4000 rpm