What experience do you have about swapping vs. rebuilding? minor fab work is not the right way of doing a swap.
its the cheap, fast and deadly way.
IMHO I would not want a 490 to rip out of the frame and injure me because i wanted something "faster" than a rebuild.
Look for the swap threads and check the dates. LMK if they took less than a week from first post date to last and i will eat my words
There is a swap going on right now that started months before you joined and i dont even think the motor is mounted yet because they are doing it right
http://www.blasterforum.com/threads/yz250-blaster-build-log.62217/page-7