I have an 05 BF 650, I took it last week to have recall work done on the front end. They replaced the A arm and other parts on it. Well I went riding today for the first time since I got it back and was there maybe 15 minutes when I switched to 4x4. I then switched back out and both front wheels locked up completely. Got pulled back to the truck and the front end actually freed up. So I rode a little more in 4x4 to see what would happen and when I switched to 2 it locked up again and was popping a little. If any of you have any input , it would be greatly appreciated.