There are quite a few posts on this already here. But I'm asking it anyway as they were not "Trident" related. I started to notice this old-school internet modem buzzing sound on my new Trident (2 days old). It does not go away. There are no issues with the ignition, the bike seems to run fine. Here's the video link: https://streamable.com/z5jmz7 Is it something to be concerned about? Call it bad timing, I live in Vancouver, Canada and the SVCs are closed on Sundays and Mondays. And I've got a really busy week ahead.
Sounds exactly the same as the noise I get from the fuel injectors on my Speedmaster. As this question re-occurs for different bike I'd assume its normal and not worry about it. (I've done 27,000 miles with the whining and had no engine problems)