[Click the picture to see it bigger in a new window.
But this is not true for all the pictures...]
According to some sources Yamaha XS650 is the most British motorcycle ever built
by the Japanese. Based on the typical sound the motor creates when running and
especially on the vibrations that you can't leave without a notice the Yamaha XS650
has gotten the nick name "Jytäri" in Finland. This is impossible to translate to
English but it means like "a thing vibrating with a huge and powerful amplitude".
For that reason Yamaha XS650 Finland is called "Jytäristit" in Finnish.
Meaning "The people that can control the thing vibrating with a huge and powerful amplitude".
There are a lot of sources in the internet describing the technology and the history of Yamaha XS650.
Take a look for example: