I would run it through a few heat cycles by letting it idle up to operating temp and then cut it off and let it cool completely. Ride it for about 15-20 minutes at a time after that varying the throttle speed but try not to really stab the throttle or ride it wide open. I would ride it for awhile using lower throttle positions and then increase the range of throttle everytime you ride it. You can rev it some, also try not to ride at one set speed. Let it cool completely in between the rides. After a few gallons of gas you should be set. I'd run it a little rich for the break in also, seems like this lets the parts polish themselves a little better. I know everyone else has their own method, but this seems to work well for me. Hope this helps, maybe someone else will chime in and give their 2 cents.