Join Date: Dec 2008
Location: Idaho Falls, Idaho
For your weight you will need to consider new front springs and a new spring for the rear shock. If you do the work yourself, it isn't all that expensive for the parts (couple hundred $$) but if you don't have the tools and need to hire it out I have no idea what the cost will be.
I put linear rate springs in my DL650 ($90 from Sonic Springs) and a few more dollars for new seals and oil. I swapped the rear spring for a heavier one as well (ordered from Wilbers USA for ~$140 or so. I'm not sure Wilbers has a US office anymore but other companies can supply the spring). The rear shock is best done with a hydraulic press that is used to remove the collar from the top. There are instructions out on the web somewhere if you search long enough. There is a very small set screw on the preload adjuster collar that can get frozen but must be removed to release the collar and expose the ring clip that lets you take the spring off the shock body. If that set screw gets fouled up, it is real fun to remove (ask me how I know). Then you have to drill a new hole and thread it for a new set screw (best done on a milling machine). So, many people simple swap out the whole assembly with an aftermarket shock already built for their weight. That will run you another ~$650 and up depending on how fancy of a shock you want.
If you have ridden many sportbikes, you will likely be disappointed with the 650s performance (watch me get crucified by the 650 advocates). However, I ride a CBR600F4i for twisties and a 2008 Hayabusa on the street, so I have some modest experience with fast bikes. I sold my 650 this year after 30,000 miles and now own a DL 1000 (already nearly 9000 miles this year). I have made no changes to the 1000 suspension for my weight and it is fine. I also enjoy the 30 or so more hp and torque.
That's my opinion anyway!
2008 DL1000, Two Brothers, PCV, etc., etc.
2008 GSX1340R Hayabusa, Velocity Racing Turbo, boost controller, water injected
2008 GSX-R600, Akrapovic full Ti, PCV w/AutoTune
DynoJet 250 dynamometer (just learning to use it)