This may have been discussed before, I'm not sure. However, I am posting an update to help with that problem. Both my 2018 DCT 2 wheel and my new 2018 DCT Trike had the same problem. The 30mm center nut on the top of the handlebar mount comes loose or was never really tightened properly at the factory.

The first bike I used blue threadlock by permatex and it seemed to do just fine. On my new trike, I found this product https://www.permatex.com/slider/new-...-threadlocker/ which to my surprise is better than blue but not like the red which is almost impossible to break loose without damage. This new orange stuff is stronger and made specifically for high vibration problems. The package even shows a motorcycle and a chainsaw as examples.

I recently torqued mine to specs with the orange stuff and so far it's been tight like it should be. Just wanted to spread the news about this new orange stuff for everyone that may need it and not know about it.