If this is the same set-up as my 2009 Bav 38, the comments above are correct.
I would strongly recommend that when putting the chain back on, the tension is checked and the location of the bottle screws is checked to ensure you can turn the wheel full lock.
The bottle screws can work loose easily. Be sure to adjust the nuts tightly and apply the Loctite to ensure they won't come undone.
Craig
"Shirley Valentine"
Gold Coast
Australia