Triumph Rocket 3.

This is the first one of these I've had a look at, of course it was too noisy for comfort but still much quieter than those USA carthorses that turn fuel into noise.

 What's odd about it is I couldn't see an oil leak, on British bikes of my younger vintage no leaks would be a sure sign of it needing oil rather badly. Making bikes like this and having the sense to use a shaft drive should give some hope for the future.
I'm rather staggered that final drive chains are still used by most bikes, I would have thought the chain would have been reduced to a niche market method 35 years ago.