Page 2 of 2

Re: Sound Testing

Posted: Wed May 31, 2017 2:01 pm
by AJRJ
Well, it depends :D

Some 450s are quieter (Honda) or louder (Kawasaki) with KTMs somewhere in the middle? Most bikes should pass the FIM test that's randomly employed now.

For the spark arrestor it is not required to deviate from stock, but encouraged. We all want to be responsible in our new environment of extreme scrutiny. Consider the use of a FMF Q4 or similar if possible.

:thumbsup:

Re: Sound Testing

Posted: Wed May 31, 2017 2:32 pm
by malcolmzilla
2015 YZ250FX stock exhaust FAILED Idaho City 100 testing in 2016, USFS 96dba limit I believe.
This is the "euro" mx can on the FX models, so is supposedly quieter than North America MX version (YZF).

Re: Sound Testing

Posted: Wed May 31, 2017 10:32 pm
by malcolmzilla
Idaho city 100 they place a microphone by exhaust blip throttle. Spark arrestor test is rod inserted into pipe to see if it stops before full insertion.

Re: Sound Testing

Posted: Thu Jun 01, 2017 12:26 pm
by AJRJ
The FIM recommends the "2 metre Max" method.

The mic is 2m away from the exhaust outlet at 45 degrees, and the motorcycle is help at max RPM for 1 second.