I read in one of the dirt bike mags that lowering the radiators 2 1/2 inches lowered the center of gravity on the YZ450F. All the riders of the test bike noticed the difference and liked the handling. The magazine is the August Motorcross Action. The lowering was done by PWR a custom radiator shop (Clint Barry owns the shop) I looked at my XR650R and it looks like you could lower the radiators. It will require some new brackets and mounts. I would like to put Ms Piggy on a diet but lowering the center of gravity would also make the bike feel lighter.