Couple of more interesting things about the TU.
The cylinder uses a special coating similar to
Nikasil plated directly on the aluminum cylinder walls. This lowers weight by eliminating the cylinder sleeve. But it also means you can't easily bore this engine out for more power.
Also, the TU doesn't meet California CARB emission standards, so it's a 49 state bike. This was almost a dealbreaker for my wife, who wanted the cleanest bike she could get. But in the end, she decided that its modern, fuel injected engine was clean enough, and since she also wanted a light bike with the right ergonomics, it was the obvious choice.