G'day guys, first post so please be gentle.

I own a 2010 XT660Z Tenere, and whilst parking (reversing into the gutter) my left foot slipped and over I went. The bike came down on the left side, noticeably on the gear selector. When I picked the bike up there were a few minor scratches etc but I didn't notice anything else.
Upon starting the bike I couldn't select a gear, and upon closer inspection the gear selector had about 1/2 an inch movement. When I pulled the selector away from the motor I could select gears, but whilst riding it seemed it would vibrate in and select neutral.
The local yamaha agent ascertained that a circle was missing that held a washer in and the selector out.
After picking up the bike the problem is still there, just not as bad.

Has anybody has any experience with this issue, any help appreciated.

regards

Chris