you need to respring your forks/shock.
these bikes are set up for 180+ lb riders. i have all my settings all the way soft and its still stiff as ****.
my friend had her s1k resprung and revalved for her (110lbs) and it made a night and day difference! bike handles like a dream now.
1986 BMW 316i (1st bimmer) sold
1993 BMW 318i (Euro spec) sold
2003 BMW 325i sold
2006 Kawi ZX6R (my first love) sold
2010 Kawi BruteForce 750i sold
2011 BMW 328XI
2011 BMW S1K Yellow
-ZGravity corsa w/s, Yoshi sliders, RG mirror blk offs, GB case svrs, CRG lvrs, Andreani Group 30mm kit, XBK5 pads, Woodcraft spools, stompgrips, Attack rearsets, Ohlins damper, Renthal sprockets, DIDERV3 chain 520 Conv, Full race Akrapovic SS w carbon hanger, BrenTuned