now that the jetting seems sorted on my 550k, decided to start tuning the suspension:
over the weekend i took a 3 hr ride and started to really push the 550k around. sunday night i removed the springs, and noted they're 18 1/2inches long. (spec is 17 1/2in with a service limit of 16 1/2inch - a mystery!). i need to check front static/rider sag.
i pumped out the atf i put in over the winter re-fresh, and put in 6oz of Motul full synthetic 5w. just back from a 100 mile test run in eastern ny/western vt and wow, a noticable improvement. very smooth action now.
my shocks are toast, so i ordered hagons. nitrogen filled, auto-adjust for rebound/compression, progressivly wound springs, adjustable for pre-load only. my 550 is a lighter than stock, and i'm only 155 (wet) so the tech dude suggested a spring rate of 18kg. $199 shipped and will be here in a few days.
i can adjust sag up front with spacers, rear with c-spanner.
long story short - have you looked a hagons?