Sound Test info help?

[REVERUP]

I'm looking for the official rpm standard for sound testing in the U.S. for Gas Gas motorcycles. Anyone know where on the web to find that info?

I think for the 300 it is, 5550 but don't remember.

I can find every other brand and model out there but Gas Gas.

We had a booklet with all the makes and models through the years and have lost it. We are trying to put together a new book for the club and others in our series.
Any help would be appreciated.

Roscoe

 

[gasgasman]

The AMA has a nice sound testing booklet you can get for free.
If I remember, it does list Gas Gas.

Here' some good info...
http://www.amadirectlink.com/legisltn/soundbook.pdf

 

[REVERUP]

Thanks gasgasman.

The standard is tested at half the maximum rated rpm.

So If I knew the maximum rpm data for the ec range I would have what I need.

Can't find that info either.

Anyone know those maximum rpm numbers?

 

[Qui-gon]

If it is SAE J1287 it is half rated speed measured by tacho to an accuracy of +- 3%.
According to the spec if it is a racing bike the following equation applies:

Test speed = 30600/ stroke (mm) or 12000/ stroke (in).

If you need a pdf copy of the sae sound test let me know.