Out riding yesterday the motor died and made a noise similiar to the drive chain coming off the sprockets and binding up, but not quite as loud. I looked down to see the chain stillriding on both sprockets and then tried to restart the bike. The bike would not hit TDC, just kept cranking over. It feels like there is still decent compression. I did a couple of things the day before and I'm not certain they had a role in all of this or not. 1. put on a FMF powebomb and Q silencer (162 main, 42 PJ, needle in 3rd & 2.5 turns on the fuel screw) and 2. removed the screen from the frame oil reservoir. I took it out to clean it for the first time and it was trashed from the previous owner and wasn't filtering anything, so I removed it. Could the jetting have anything to do with this? Or the oil screen in the frame? Any guesses on what happened? I cant tear into it until Wed.