The difference in effort involved on putting two similar machines on the
centerstand lies in the ride height of the machines. This became evident when
at our first east coast GTS gathering we compared ride heights of my brother
in law's GTS to everyone else's. His was noticeably lower and noticeably more
difficult to put on the center stand. The rear spring preload controls this
on the GTS (with a stock shock). The less preload you run, the lower your
ride height will be. The next chance you get, compare the height of the seat
on your bike to the height of the seat on the bike that is easier to get on
the center stand. On the off chance that is similar or close, check the
distance from a point on the frame above the swingarm down to the swing arm
to see if the shock is fully extending. Anything that lowers the rear of the
bike reduces the angle of the lever, thus reducing leverage, of the
centerstand, increasing the force required to get the bike on the stand.
RSRBOB