Just a yamaha patent

[sk-rx1]

Seems to me that the lower a arm in this picture is much higher than where cat has it located now.
If you read 017 it states this design is good in deep snow where the lower arms will drag in the snow.
Looks like a mod for mountain sleds to me.

I just read that AC changed the spindle on their Sno Cross sled to raise the lower a frame

 

[Mortagleus]

There was also a few more patents on the that site as well. http://stks.freshpatents.com/Yamaha-Hatsudoki-Kabushiki-Kaisha-nm1.php

 

[HighSpeedLowDrag]

This patent for the use of a four cylinder desaxe engine in a straddled vehicle is interesting. http://www.freshpatents.com/-dt20170928ptan20170276213.php