It's exhausting stuff (it's alright, I'm here all week). This might be taking bike prep a step too far, but I'm not keen on the idea of having my bike turned away from scrutineering any time soon! I decided to get a decibel meter and do my own sound testing to make sure my bike isn't too noisy.
Yes, a lot of people would say I'm taking it too seriously but I wouldn't want to be the guy who takes time off work, pays the entry fee, travels to an event, pays for accommodation and then gets turned away on race day. Besides, this bike is still new to me and there are a few things like this where I don't know when they were previously done (if ever).
So there we go, gadget purchased for a tenner off eBay, I set it up on a tripod at exhaust level 2 metres away as per the ACU Handbook and let her rip! The limit is 112db, and mine was too close for comfort, so I've ordered some new packing and will sort it before the next race. My guess is it hasn't been done since it left the factory 100 hours ago.