First question - lets sort out does the xcf come with a heavier flywheel than the sxf? I thought that it did but it was a year ago I bought the bike and not so sure on that point anymore. I know a few of you have put on a plus 8oz on your 505sxf's. Maybe because my bike felt so unstoppable I just assumed it had a heavier flywheel from stock. second question - for those who have done it what have you noticed other than not stalling as much. Does the top end feel tamed down? My bike is pretty unstopable now but it's not like I have never stalled it up some ugly stuff. Considering the heavier flywheel option if it already doesn't have it but don't want to lose too much on the top end for the sand dunes and the track.