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Adam, when i go racing my car some tracks have sound restrictions too. There are always 2 tests - standing still 1000rpm below redline, and flying test on the main straight from behind the pit wall. This would ensure that those bikes that tinker with timing under light load get tested properly while they are running.
80db is pretty fricken quiet as a peak noise. As a typical operating on the street noise, sure... but the 96dB mentioned above is a more reasonable peak. (of course, dB is proportional to distance of measure, so i guess i'm talkin out my ass. We do standing tests at 98dB 15ft behind the vehicle, and flying tests at 90dB 50ft to the side)
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